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if x is equal to the square root of 81 then x is ±9 (plus or minus 9)

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โˆ™ 2010-03-24 22:17:20
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Q: If X is equal to the square root of 81 what is X?
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What is the squared root of 81?

The square root of 81 is 9. 9 x 9 = 81.


What is the length of the sides of a square with and area of 324 centimeters squared?

Square root of 324 = square root of (81 x 4) = square root of 81 x square root of 4 and that is 9 x 2 = 18 cm


What is the square root of 405?

81 is the square root of 405. (81 x 5 = 405.)


What is the easiest way to find the square root?

the eisest way to find square root of something , is to see what number x itself = that number .... so EXAMPLE:what is the square root of 81? this is how you will find it.....so what number x itself gives me 81? it's 9 because 9x9=81 so the square root of 81 is 9


Can 18 be a square root of 81?

Gee, I don't know. Let's check it out. If it is, then 18 x 18 = 81 . 18 x 18 = 324 Nope. 18 x 18 is not 81, so 18 is not a square root of 81.


Square root of 1296?

Square root of (1296) =Square root of (16 x 81)=SQ. root of (16) x Sq. root of (81) =4 x 9 =36


Square root x plus 3 equals 12?

X = 81 sqrt(X) + 3 = 12 ( subtract 3 from each side ) sqrt(X) = 9 (square both sides ) X = 81 ( the square root of 81 is 9 )


What is the sqare route of 81?

The square root of 81 is 9 as in 9 x 9 = 81


What is a perfect square between the numbers 70-85?

155


What is the positive sqare root of a number?

Square roots can be positive or negative. 9 x 9 = 81 -9 x -9 = 81 9 is the positive square root of 81.


What is the square root of 81 100ths?

While it is true that 9/10 x 9/10 = 81/100, fractions do not have square roots.


How many acres are in 81 square miles?

There are 640 acres in one square mile. Therefore, 81 square miles is equal to 81 x 640 = 51840 acres.


Square root of a square is equal to?

that makes no sense if you mean square root to the power 2 its equal: the number in the root (let it =x) in absolute value then its equal=: x or -x im not sure


What is the nonnegative square root of a number?

Definition of Square Root: The Square Root of a number 'X' is equal to 'A' when X=A*A By definition, the square root of a positive number has two answers, one negative and one positive, that have equal magnitudes. i.e. The square roots of 4 are 2 and -2. The Non-Negative Square Root is simply asking for the positive root.


If x is any real number then why is the square root of x2 not equal to x?

say x=-2, the x^2=4, but the square root of 4 is 2 because we always take the positive value, known as the principal root. Using this square root of x^2=|x|. So if x is greater than or equal 0, than square root of x^2 is x, but if x is less than zero we must take its abolute value.


What is the square root of 81?

The square root of 81 is: ±9 (9 or -9)A square root is a number which, when multiplied by itself, equals the original number. As 9 x 9 = 81 and -9 x -9 = 81, the answer is plus or minus nine.


What is the perimeter of a square that has an area of 81 meters square?

36, area is equal to length X width, perimeter is equal to 2(length)+2(width) in a square length is equal to width, so we take the square root of the area to find that both are 9, which means the perimeter is 9 X 4, 36.


What is x to 2nd power equal 54?

x^2 = 54; take the square root of both sides, so x = +/- square root of 54 , or simplified is +/- 3 times square root of 6.


How do you solve x squared equals negative 81?

x2=-81take the square root of both sidessince 81 is negative you need to take 81 times i when i=-1 then solve as the square root of 81. your answer is x=9i


What is the square root of eighty one?

Square root of 81 has two solutions: SQRT(81) = +9 and -9 SQRT(81) = +9. The square root function has just a single output for every input. It, by definition, returns the positive 2nd root of the function. So SQRT(x) is always non-negative. This is distinctly different than saying, "what number squared equals 81?" That refers to solutions to the equation x^2 = 81, of which there are two.....+9 and -9.


What is equal to the square root of 49 times the square root of 9?

Square root of 49 = 7... Square root of 9 = 3... 3 x 7 = 21


What is the simplified square root of 486?

486 = 81 x 6 sqrt 486 = sqrt (81 x 6) = 9sqrt(6)


The square root of X-5 is a real number if and only if?

X is greater than 5. If X were equal to 5, X-5 would be 0 which has no real square root. If X were 4, X-5 would be -1 which has no real square root, and so on.


Is the square root of x and the square root of NEGATIVE x both rational and irrational?

Yes, because when x equals 1, the square root of x is rational and the square root of -x is irrational, and when x equals -1, the square root of x is irrational and the square root of -x is rational.


Can the square root of x be added to the square root of 3x?

No. The Square root of x is not the value of x. So it can not be simplified beyond: Root X + root 3x Yes. The square root of 3x equals the square root of 3 times the square root of x, so when you add another square root of x, you can factor out the square root of x, thereby simplifying the expression to the square root of x times the sum of one plus the square root of three.

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