f(0)=9x^2-16

Solution for f(0)=9x^2-16 equation:

Simplifying
f(0) = 9x2 + -16

Reorder the terms for easier multiplication:
0f = 9x2 + -16

Anything times zero is zero.
0f = 9x2 + -16

Reorder the terms:
0 = -16 + 9x2

Solving
0 = -16 + 9x2

Solving for variable 'x'.

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

Add '-9x2' to each side of the equation.
0 + -9x2 = -16 + 9x2 + -9x2
Remove the zero:
-9x2 = -16 + 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
-9x2 = -16 + 0
-9x2 = -16

Divide each side by '-9'.
x2 = 1.777777778

Simplifying
x2 = 1.777777778

Take the square root of each side:
x = {-1.333333333, 1.333333333}