7m+8m(m-5)=-100

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Solution for 7m+8m(m-5)=-100 equation:


Simplifying
7m + 8m(m + -5) = -100

Reorder the terms:
7m + 8m(-5 + m) = -100
7m + (-5 * 8m + m * 8m) = -100
7m + (-40m + 8m2) = -100

Combine like terms: 7m + -40m = -33m
-33m + 8m2 = -100

Solving
-33m + 8m2 = -100

Solving for variable 'm'.

Reorder the terms:
100 + -33m + 8m2 = -100 + 100

Combine like terms: -100 + 100 = 0
100 + -33m + 8m2 = 0

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
12.5 + -4.125m + m2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + -4.125m + -12.5 + m2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + -4.125m + m2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -4.125m + m2 = 0 + -12.5
-4.125m + m2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
-4.125m + m2 = -12.5

The m term is -4.125m.  Take half its coefficient (-2.0625).
Square it (4.25390625) and add it to both sides.

Add '4.25390625' to each side of the equation.
-4.125m + 4.25390625 + m2 = -12.5 + 4.25390625

Reorder the terms:
4.25390625 + -4.125m + m2 = -12.5 + 4.25390625

Combine like terms: -12.5 + 4.25390625 = -8.24609375
4.25390625 + -4.125m + m2 = -8.24609375

Factor a perfect square on the left side:
(m + -2.0625)(m + -2.0625) = -8.24609375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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