(10+x)(10-x)=840

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Solution for (10+x)(10-x)=840 equation:


Simplifying
(10 + x)(10 + -1x) = 840

Multiply (10 + x) * (10 + -1x)
(10(10 + -1x) + x(10 + -1x)) = 840
((10 * 10 + -1x * 10) + x(10 + -1x)) = 840
((100 + -10x) + x(10 + -1x)) = 840
(100 + -10x + (10 * x + -1x * x)) = 840
(100 + -10x + (10x + -1x2)) = 840

Combine like terms: -10x + 10x = 0
(100 + 0 + -1x2) = 840
(100 + -1x2) = 840

Solving
100 + -1x2 = 840

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + -1x2 = 840 + -100

Combine like terms: 100 + -100 = 0
0 + -1x2 = 840 + -100
-1x2 = 840 + -100

Combine like terms: 840 + -100 = 740
-1x2 = 740

Divide each side by '-1'.
x2 = -740

Simplifying
x2 = -740

Reorder the terms:
740 + x2 = -740 + 740

Combine like terms: -740 + 740 = 0
740 + x2 = 0

The solution to this equation could not be determined.

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