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Simplifying
0.5(5x) * x = 90
Remove parenthesis around (5x)
0.5 * 5x * x = 90
Multiply 0.5 * 5
2.5x * x = 90
Multiply x * x
2.5x2 = 90
Solving
2.5x2 = 90
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '2.5'.
x2 = 36
Simplifying
x2 = 36
Take the square root of each side:
x = {-6, 6}
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