5m^2-21=-8m

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Solution for 5m^2-21=-8m equation:


Simplifying
5m2 + -21 = -8m

Reorder the terms:
-21 + 5m2 = -8m

Solving
-21 + 5m2 = -8m

Solving for variable 'm'.

Reorder the terms:
-21 + 8m + 5m2 = -8m + 8m

Combine like terms: -8m + 8m = 0
-21 + 8m + 5m2 = 0

Factor a trinomial.
(-3 + -1m)(7 + -5m) = 0

Subproblem 1

Set the factor '(-3 + -1m)' equal to zero and attempt to solve: Simplifying -3 + -1m = 0 Solving -3 + -1m = 0 Move all terms containing m to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1m = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1m = 0 + 3 -1m = 0 + 3 Combine like terms: 0 + 3 = 3 -1m = 3 Divide each side by '-1'. m = -3 Simplifying m = -3

Subproblem 2

Set the factor '(7 + -5m)' equal to zero and attempt to solve: Simplifying 7 + -5m = 0 Solving 7 + -5m = 0 Move all terms containing m to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -5m = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -5m = 0 + -7 -5m = 0 + -7 Combine like terms: 0 + -7 = -7 -5m = -7 Divide each side by '-5'. m = 1.4 Simplifying m = 1.4

Solution

m = {-3, 1.4}

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