-x^2+11x=28

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Solution for -x^2+11x=28 equation:


Simplifying
-1x2 + 11x = 28

Reorder the terms:
11x + -1x2 = 28

Solving
11x + -1x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 11x + -1x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 11x + -1x2 = 0

Factor a trinomial.
(-7 + x)(4 + -1x) = 0

Subproblem 1

Set the factor '(-7 + x)' equal to zero and attempt to solve: Simplifying -7 + x = 0 Solving -7 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + x = 0 + 7 x = 0 + 7 Combine like terms: 0 + 7 = 7 x = 7 Simplifying x = 7

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {7, 4}

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