2+w*w-20=0

Solution for 2+w*w-20=0 equation:

Simplifying
2 + w * w + -20 = 0

Multiply w * w
2 + w2 + -20 = 0

Reorder the terms:
2 + -20 + w2 = 0

Combine like terms: 2 + -20 = -18
-18 + w2 = 0

Solving
-18 + w2 = 0

Solving for variable 'w'.

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

Add '18' to each side of the equation.
-18 + 18 + w2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + w2 = 0 + 18
w2 = 0 + 18

Combine like terms: 0 + 18 = 18
w2 = 18

Simplifying
w2 = 18

Take the square root of each side:
w = {-4.242640687, 4.242640687}