500*500=(300*300)+x^2

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Solution for 500*500=(300*300)+x^2 equation: 


Simplifying
500 * 500 = (300 * 300) + x2

Multiply 500 * 500
250000 = (300 * 300) + x2

Multiply 300 * 300
250000 = (90000) + x2
250000 = 90000 + x2

Solving
250000 = 90000 + 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.
250000 + -1x2 = 90000 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
250000 + -1x2 = 90000 + 0
250000 + -1x2 = 90000

Add '-250000' to each side of the equation.
250000 + -250000 + -1x2 = 90000 + -250000

Combine like terms: 250000 + -250000 = 0
0 + -1x2 = 90000 + -250000
-1x2 = 90000 + -250000

Combine like terms: 90000 + -250000 = -160000
-1x2 = -160000

Divide each side by '-1'.
x2 = 160000

Simplifying
x2 = 160000

Take the square root of each side:
x = {-400, 400}

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