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Simplifying
784 = 800 + -4x2
Solving
784 = 800 + -4x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '4x2' to each side of the equation.
784 + 4x2 = 800 + -4x2 + 4x2
Combine like terms: -4x2 + 4x2 = 0
784 + 4x2 = 800 + 0
784 + 4x2 = 800
Add '-784' to each side of the equation.
784 + -784 + 4x2 = 800 + -784
Combine like terms: 784 + -784 = 0
0 + 4x2 = 800 + -784
4x2 = 800 + -784
Combine like terms: 800 + -784 = 16
4x2 = 16
Divide each side by '4'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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