0
x^2 = 4
We note that '4' = 2^2
So we write
x^2 = 2^2
You could square root both sides to x = 2 , but that is not the whole answer.
So we write
x^2 - 2^2 = 0
Remember two squared terms with a NEGATIVE between will factor. NB A POSITIVE does not factor.
X^2 - 2^2 = 0
(x - 2)(x + 2) = 0 NB Note the different signs.
x - 2 = 0
x = 2 ( as before)
&
x + 2 = 0
x = -2
So 'x' can have two values a positive and a negative; not just a positive.
This result is often written as x = +/-2 .
Add your answer:
Earn +20 pts
Is this equation linear X squared plus y squared equals 4?
No because no 2 numbers can be squared to equal 4. 1 squared is 1 2 squared is 4 so the lowest answer is 5.
Is 4y squared plus 9 equals - 4 a linear equation?
No. It's a quadratic equation, and it has two solutions.
What is the equation for 2x-6 equals 4?
This is already the equation. Now you just have to solve it. x=5.
Where is the center of the circle given by the equation x plus 4 squared plus y plus 6 squared equals 49?
(-4,-6)
Use 3x equals 12 solve the equation?
12/3 = 4
How do you solve this equation -a equals -4?
Easy! if -a = -4 then a = 4!!
How much greater is 4 squared than 3 squared?
The greatness of 4 squared and 3 squared is expressed by the equation: 16 - 9 which equals 7.3 squared equals 3 x 3 = 94 squared equals 4 x 4 = 1616 - 9 = 7
Solve each equation by graphing Round to the nearest tenth x squared minus 6x equals -8?
14
Is this equation linear X squared plus y squared equals 4?
No because no 2 numbers can be squared to equal 4. 1 squared is 1 2 squared is 4 so the lowest answer is 5.
Is 4y squared plus 9 equals - 4 a linear equation?
No. It's a quadratic equation, and it has two solutions.
Solve linear equation 2y equals 3x-4?
2y-3x=4
Is four y squared plus nine equals 4 a linear equation?
No, it is not.No, it is not.
What is the equation for 2x-6 equals 4?
This is already the equation. Now you just have to solve it. x=5.
Where is the center of the circle given by the equation x plus 4 squared plus y plus 6 squared equals 49?
(-4,-6)
Solve this equation -3x plus 14 equals -4?
x = 6
Use 3x equals 12 solve the equation?
12/3 = 4
How do you solve the equation 75 plus 4 equals -2?
An equation is a true statement. [ 75 + 4 = -2 ] is a false statement.
