42*42=(20.4*20.4)+x^2

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Solution for 42*42=(20.4*20.4)+x^2 equation: 


Simplifying
42 * 42 = (20.4 * 20.4) + x2

Multiply 42 * 42
1764 = (20.4 * 20.4) + x2

Multiply 20.4 * 20.4
1764 = (416.16) + x2
1764 = 416.16 + x2

Solving
1764 = 416.16 + x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
1764 + -1x2 = 416.16 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1764 + -1x2 = 416.16 + 0
1764 + -1x2 = 416.16

Add '-1764' to each side of the equation.
1764 + -1764 + -1x2 = 416.16 + -1764

Combine like terms: 1764 + -1764 = 0
0 + -1x2 = 416.16 + -1764
-1x2 = 416.16 + -1764

Combine like terms: 416.16 + -1764 = -1347.84
-1x2 = -1347.84

Divide each side by '-1'.
x2 = 1347.84

Simplifying
x2 = 1347.84

Take the square root of each side:
x = {-36.712940498, 36.712940498}

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