(7m^2+3m-4)-(3m^2+9m-5)=

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Solution for (7m^2+3m-4)-(3m^2+9m-5)= equation:


Simplifying
(7m2 + 3m + -4) + -1(3m2 + 9m + -5) = 0

Reorder the terms:
(-4 + 3m + 7m2) + -1(3m2 + 9m + -5) = 0

Remove parenthesis around (-4 + 3m + 7m2)
-4 + 3m + 7m2 + -1(3m2 + 9m + -5) = 0

Reorder the terms:
-4 + 3m + 7m2 + -1(-5 + 9m + 3m2) = 0
-4 + 3m + 7m2 + (-5 * -1 + 9m * -1 + 3m2 * -1) = 0
-4 + 3m + 7m2 + (5 + -9m + -3m2) = 0

Reorder the terms:
-4 + 5 + 3m + -9m + 7m2 + -3m2 = 0

Combine like terms: -4 + 5 = 1
1 + 3m + -9m + 7m2 + -3m2 = 0

Combine like terms: 3m + -9m = -6m
1 + -6m + 7m2 + -3m2 = 0

Combine like terms: 7m2 + -3m2 = 4m2
1 + -6m + 4m2 = 0

Solving
1 + -6m + 4m2 = 0

Solving for variable 'm'.

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

Divide each side by '4'.
0.25 + -1.5m + m2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + -1.5m + -0.25 + m2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + -1.5m + m2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + -1.5m + m2 = 0 + -0.25
-1.5m + m2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
-1.5m + m2 = -0.25

The m term is -1.5m.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5m + 0.5625 + m2 = -0.25 + 0.5625

Reorder the terms:
0.5625 + -1.5m + m2 = -0.25 + 0.5625

Combine like terms: -0.25 + 0.5625 = 0.3125
0.5625 + -1.5m + m2 = 0.3125

Factor a perfect square on the left side:
(m + -0.75)(m + -0.75) = 0.3125

Calculate the square root of the right side: 0.559016994

Break this problem into two subproblems by setting 
(m + -0.75) equal to 0.559016994 and -0.559016994.

Subproblem 1

m + -0.75 = 0.559016994 Simplifying m + -0.75 = 0.559016994 Reorder the terms: -0.75 + m = 0.559016994 Solving -0.75 + m = 0.559016994 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + m = 0.559016994 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + m = 0.559016994 + 0.75 m = 0.559016994 + 0.75 Combine like terms: 0.559016994 + 0.75 = 1.309016994 m = 1.309016994 Simplifying m = 1.309016994

Subproblem 2

m + -0.75 = -0.559016994 Simplifying m + -0.75 = -0.559016994 Reorder the terms: -0.75 + m = -0.559016994 Solving -0.75 + m = -0.559016994 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + m = -0.559016994 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + m = -0.559016994 + 0.75 m = -0.559016994 + 0.75 Combine like terms: -0.559016994 + 0.75 = 0.190983006 m = 0.190983006 Simplifying m = 0.190983006

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.309016994, 0.190983006}

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