81x^2-72+16=

Solution for 81x^2-72+16= equation:

Simplifying
81x2 + -72 + 16 = 0

Reorder the terms:
-72 + 16 + 81x2 = 0

Combine like terms: -72 + 16 = -56
-56 + 81x2 = 0

Solving
-56 + 81x2 = 0

Solving for variable 'x'.

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

Add '56' to each side of the equation.
-56 + 56 + 81x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 81x2 = 0 + 56
81x2 = 0 + 56

Combine like terms: 0 + 56 = 56
81x2 = 56

Divide each side by '81'.
x2 = 0.6913580247

Simplifying
x2 = 0.6913580247

Take the square root of each side:
x = {-0.831479419, 0.831479419}