4m^2+5m=7

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Solution for 4m^2+5m=7 equation:


Simplifying
4m2 + 5m = 7

Reorder the terms:
5m + 4m2 = 7

Solving
5m + 4m2 = 7

Solving for variable 'm'.

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

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

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

Divide each side by '4'.
-1.75 + 1.25m + m2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 1.25m + 1.75 + m2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 1.25m + m2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 1.25m + m2 = 0 + 1.75
1.25m + m2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
1.25m + m2 = 1.75

The m term is 1.25m.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25m + 0.390625 + m2 = 1.75 + 0.390625

Reorder the terms:
0.390625 + 1.25m + m2 = 1.75 + 0.390625

Combine like terms: 1.75 + 0.390625 = 2.140625
0.390625 + 1.25m + m2 = 2.140625

Factor a perfect square on the left side:
(m + 0.625)(m + 0.625) = 2.140625

Calculate the square root of the right side: 1.463087489

Break this problem into two subproblems by setting 
(m + 0.625) equal to 1.463087489 and -1.463087489.

Subproblem 1

m + 0.625 = 1.463087489 Simplifying m + 0.625 = 1.463087489 Reorder the terms: 0.625 + m = 1.463087489 Solving 0.625 + m = 1.463087489 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + m = 1.463087489 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + m = 1.463087489 + -0.625 m = 1.463087489 + -0.625 Combine like terms: 1.463087489 + -0.625 = 0.838087489 m = 0.838087489 Simplifying m = 0.838087489

Subproblem 2

m + 0.625 = -1.463087489 Simplifying m + 0.625 = -1.463087489 Reorder the terms: 0.625 + m = -1.463087489 Solving 0.625 + m = -1.463087489 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + m = -1.463087489 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + m = -1.463087489 + -0.625 m = -1.463087489 + -0.625 Combine like terms: -1.463087489 + -0.625 = -2.088087489 m = -2.088087489 Simplifying m = -2.088087489

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.838087489, -2.088087489}

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