8x^2+16x=42

Solution for 8x^2+16x=42 equation:

Simplifying
8x2 + 16x = 42

Reorder the terms:
16x + 8x2 = 42

Solving
16x + 8x2 = 42

Solving for variable 'x'.

Reorder the terms:
-42 + 16x + 8x2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + 16x + 8x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-21 + 8x + 4x2) = 0

Factor a trinomial.
2((-7 + -2x)(3 + -2x)) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(-7 + -2x)' equal to zero and attempt to solve:

Simplifying
-7 + -2x = 0

Solving
-7 + -2x = 0

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

Add '7' to each side of the equation.
-7 + 7 + -2x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -2x = 0 + 7
-2x = 0 + 7

Combine like terms: 0 + 7 = 7
-2x = 7

Divide each side by '-2'.
x = -3.5

Simplifying
x = -3.5
Subproblem 2
Set the factor '(3 + -2x)' equal to zero and attempt to solve:

Simplifying
3 + -2x = 0

Solving
3 + -2x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -2x = 0 + -3
-2x = 0 + -3

Combine like terms: 0 + -3 = -3
-2x = -3

Divide each side by '-2'.
x = 1.5

Simplifying
x = 1.5
Solution
x = {-3.5, 1.5}