x(x*1.72)=40

Solution for x(x*1.72)=40 equation:

Simplifying
x(x * 1.72) = 40

Reorder the terms for easier multiplication:
x(1.72x) = 40

Remove parenthesis around (1.72x)
x * 1.72x = 40

Reorder the terms for easier multiplication:
1.72x * x = 40

Multiply x * x
1.72x2 = 40

Solving
1.72x2 = 40

Solving for variable 'x'.

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

Divide each side by '1.72'.
x2 = 23.25581395

Simplifying
x2 = 23.25581395

Take the square root of each side:
x = {-4.822428221, 4.822428221}