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x2=-81

take the square root of both sides

since 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

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โˆ™ 2011-12-06 03:43:01
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Q: How do you solve x squared equals negative 81?
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Related questions

What squared is 81?

9 squared equals 81.


What is 9 negative squared?

81


Why is negative 9 squared negative 81?

It isn't. The square of any real number is positive. (negative 9)2 = positive 81. Did you mean negative (92) ? Well, 92 = 81, and the negative of that is negative 81.


What number equals 81 when it is squared?

.12


What is negative 9 squared?

-9 squared = 81(-9)^2 = (-9) * (-9) = 81


What so the ninth squared number?

It is 81 because 9 times 9 equals 81


How do you solve x2 81 equals 0?

x: x2 - 81 = 0


How do you solve 3 to the power of what equals 81?

34 = 81 so x is 4


Nine yards squared is equal to how many feet squared?

Nine square yards equals 81 square feet.


Solve 3x - 5x plus 11x equals -81?

23


What is 9 to the 2nd power?

92=9x9=81 9 to the second power or 9 squared (92) equals 81.


What is the root of 81 squared?

The square root of 81 squared is 81.


How many solutions does 81 squared have?

One: 81 squared = 81^2 = 6561


Why are brackets needed to square negative numbers?

If you were to do -92, following the order of operations, exponents come before subtraction. Because of this -92 = -(92) which is -81. The quantity negative nine, squared, however is positive 81. In order to show that you want the entire quantity negative nine squared, you must use parenthesis (or brackets): (-9)2 = 81. This shows to do the "subtraction" first.


9 squared plus b squared equals 12 squared?

92 = 81122 = 14481 + b2 = 144(take 81 from both sides)b2 = 63b = 7.937253933


Can you make a square from the factors of 81?

9 x 9 = 81 9 squared = 81 3 squared times 3 squared = 81


What is negative 81 minus negative 67equal?

Eight one take away negative sixty seven equals negative fourteen. This is a math problem.


What is 486 divided by 6?

81


How do you solve 3 to the power of negative 2x plus 2 equals 81?

3^(-2x + 2) = 81? log(3^(-2x + 2)) = log(81) (-2x+2)log(3) = log(81) -2x = log(81)/log(3) - 2 x = (-1/2)(log(81)/log(3)) + 1


What does 9 squared mean?

9 Squared is 81.Squared means to times a number by itself so..... 9 squared = 9x9 = 81!


Solve the proportion 3 over 9 equals x over 81?

3/9 = x/81 x = 27 So: 3/9 = 27/81


What is 3x squared - (3x) squared?

3x squared - (3x) squared = 0


How do you solve 3 to the negative 4th power?

3^(-4) = (1/3)^4 = 1/81


Factor 9x squared - 6xy plus y squared - 81?

Type your answer here... 81


What number equals nine squared?

To square a number means to multiply it by itself. Thus, 92 (read: nine squared, or nine to the second power) = 9 x 9=81