7m^2+21m=280

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Solution for 7m^2+21m=280 equation:


Simplifying
7m2 + 21m = 280

Reorder the terms:
21m + 7m2 = 280

Solving
21m + 7m2 = 280

Solving for variable 'm'.

Reorder the terms:
-280 + 21m + 7m2 = 280 + -280

Combine like terms: 280 + -280 = 0
-280 + 21m + 7m2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-40 + 3m + m2) = 0

Factor a trinomial.
7((-8 + -1m)(5 + -1m)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-8 + -1m)' equal to zero and attempt to solve: Simplifying -8 + -1m = 0 Solving -8 + -1m = 0 Move all terms containing m to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -1m = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1m = 0 + 8 -1m = 0 + 8 Combine like terms: 0 + 8 = 8 -1m = 8 Divide each side by '-1'. m = -8 Simplifying m = -8

Subproblem 2

Set the factor '(5 + -1m)' equal to zero and attempt to solve: Simplifying 5 + -1m = 0 Solving 5 + -1m = 0 Move all terms containing m to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1m = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1m = 0 + -5 -1m = 0 + -5 Combine like terms: 0 + -5 = -5 -1m = -5 Divide each side by '-1'. m = 5 Simplifying m = 5

Solution

m = {-8, 5}

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