2x^2+8-42=0

Solution for 2x^2+8-42=0 equation:

Simplifying
2x2 + 8 + -42 = 0

Reorder the terms:
8 + -42 + 2x2 = 0

Combine like terms: 8 + -42 = -34
-34 + 2x2 = 0

Solving
-34 + 2x2 = 0

Solving for variable 'x'.

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

Add '34' to each side of the equation.
-34 + 34 + 2x2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + 2x2 = 0 + 34
2x2 = 0 + 34

Combine like terms: 0 + 34 = 34
2x2 = 34

Divide each side by '2'.
x2 = 17

Simplifying
x2 = 17

Take the square root of each side:
x = {-4.123105626, 4.123105626}