(x*18)+(x*20)-x^2=280

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Solution for (x*18)+(x*20)-x^2=280 equation:


Simplifying
(x * 18) + (x * 20) + -1x2 = 280

Reorder the terms for easier multiplication:
(18x) + (x * 20) + -1x2 = 280

Reorder the terms for easier multiplication:
(18x) + (20x) + -1x2 = 280

Combine like terms: (18x) + (20x) = 38x
38x + -1x2 = 280

Solving
38x + -1x2 = 280

Solving for variable 'x'.

Reorder the terms:
-280 + 38x + -1x2 = 280 + -280

Combine like terms: 280 + -280 = 0
-280 + 38x + -1x2 = 0

Factor a trinomial.
(-28 + x)(10 + -1x) = 0

Subproblem 1

Set the factor '(-28 + x)' equal to zero and attempt to solve: Simplifying -28 + x = 0 Solving -28 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + x = 0 + 28 Combine like terms: -28 + 28 = 0 0 + x = 0 + 28 x = 0 + 28 Combine like terms: 0 + 28 = 28 x = 28 Simplifying x = 28

Subproblem 2

Set the factor '(10 + -1x)' equal to zero and attempt to solve: Simplifying 10 + -1x = 0 Solving 10 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -1x = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -1x = 0 + -10 -1x = 0 + -10 Combine like terms: 0 + -10 = -10 -1x = -10 Divide each side by '-1'. x = 10 Simplifying x = 10

Solution

x = {28, 10}

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