(2x)(x)+20=140

Solution for (2x)(x)+20=140 equation:

Simplifying
(2x)(x) + 20 = 140

Remove parenthesis around (2x)
2x(x) + 20 = 140

Multiply x * x
2x2 + 20 = 140

Reorder the terms:
20 + 2x2 = 140

Solving
20 + 2x2 = 140

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + 2x2 = 140 + -20

Combine like terms: 20 + -20 = 0
0 + 2x2 = 140 + -20
2x2 = 140 + -20

Combine like terms: 140 + -20 = 120
2x2 = 120

Divide each side by '2'.
x2 = 60

Simplifying
x2 = 60

Take the square root of each side:
x = {-7.745966692, 7.745966692}