15*10-(4x*4x)=66

Solution for 15*10-(4x*4x)=66 equation:

Simplifying
15 * 10 + -1(4x * 4x) = 66

Multiply 15 * 10
150 + -1(4x * 4x) = 66

Reorder the terms for easier multiplication:
150 + -1(4 * 4x * x) = 66

Multiply 4 * 4
150 + -1(16x * x) = 66

Multiply x * x
150 + -1(16x2) = 66

Remove parenthesis around (16x2)
150 + -1 * 16x2 = 66

Multiply -1 * 16
150 + -16x2 = 66

Solving
150 + -16x2 = 66

Solving for variable 'x'.

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

Add '-150' to each side of the equation.
150 + -150 + -16x2 = 66 + -150

Combine like terms: 150 + -150 = 0
0 + -16x2 = 66 + -150
-16x2 = 66 + -150

Combine like terms: 66 + -150 = -84
-16x2 = -84

Divide each side by '-16'.
x2 = 5.25

Simplifying
x2 = 5.25

Take the square root of each side:
x = {-2.291287847, 2.291287847}