=4x^2-9

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Solution for =4x^2-9 equation: 


Simplifying
0 = 4x2 + -9

Reorder the terms:
0 = -9 + 4x2

Solving
0 = -9 + 4x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x2' to each side of the equation.
0 + -4x2 = -9 + 4x2 + -4x2
Remove the zero:
-4x2 = -9 + 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-4x2 = -9 + 0
-4x2 = -9

Divide each side by '-4'.
x2 = 2.25

Simplifying
x2 = 2.25

Take the square root of each side:
x = {-1.5, 1.5}

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