168.2=i^2(20)

Solution for 168.2=i^2(20) equation:

Simplifying
168.2 = i2(20)

Reorder the terms for easier multiplication:
168.2 = 20i2

Solving
168.2 = 20i2

Solving for variable 'i'.

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

Add '-20i2' to each side of the equation.
168.2 + -20i2 = 20i2 + -20i2

Combine like terms: 20i2 + -20i2 = 0
168.2 + -20i2 = 0

Add '-168.2' to each side of the equation.
168.2 + -168.2 + -20i2 = 0 + -168.2

Combine like terms: 168.2 + -168.2 = 0.0
0.0 + -20i2 = 0 + -168.2
-20i2 = 0 + -168.2

Combine like terms: 0 + -168.2 = -168.2
-20i2 = -168.2

Divide each side by '-20'.
i2 = 8.41

Simplifying
i2 = 8.41

Take the square root of each side:
i = {-2.9, 2.9}