(4x-7)(x+16)=68

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Solution for (4x-7)(x+16)=68 equation:


Simplifying
(4x + -7)(x + 16) = 68

Reorder the terms:
(-7 + 4x)(x + 16) = 68

Reorder the terms:
(-7 + 4x)(16 + x) = 68

Multiply (-7 + 4x) * (16 + x)
(-7(16 + x) + 4x * (16 + x)) = 68
((16 * -7 + x * -7) + 4x * (16 + x)) = 68
((-112 + -7x) + 4x * (16 + x)) = 68
(-112 + -7x + (16 * 4x + x * 4x)) = 68
(-112 + -7x + (64x + 4x2)) = 68

Combine like terms: -7x + 64x = 57x
(-112 + 57x + 4x2) = 68

Solving
-112 + 57x + 4x2 = 68

Solving for variable 'x'.

Reorder the terms:
-112 + -68 + 57x + 4x2 = 68 + -68

Combine like terms: -112 + -68 = -180
-180 + 57x + 4x2 = 68 + -68

Combine like terms: 68 + -68 = 0
-180 + 57x + 4x2 = 0

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

Divide each side by '4'.
-45 + 14.25x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 14.25x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 14.25x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 14.25x + x2 = 0 + 45
14.25x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
14.25x + x2 = 45

The x term is 14.25x.  Take half its coefficient (7.125).
Square it (50.765625) and add it to both sides.

Add '50.765625' to each side of the equation.
14.25x + 50.765625 + x2 = 45 + 50.765625

Reorder the terms:
50.765625 + 14.25x + x2 = 45 + 50.765625

Combine like terms: 45 + 50.765625 = 95.765625
50.765625 + 14.25x + x2 = 95.765625

Factor a perfect square on the left side:
(x + 7.125)(x + 7.125) = 95.765625

Calculate the square root of the right side: 9.785991263

Break this problem into two subproblems by setting 
(x + 7.125) equal to 9.785991263 and -9.785991263.

Subproblem 1

x + 7.125 = 9.785991263 Simplifying x + 7.125 = 9.785991263 Reorder the terms: 7.125 + x = 9.785991263 Solving 7.125 + x = 9.785991263 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.125' to each side of the equation. 7.125 + -7.125 + x = 9.785991263 + -7.125 Combine like terms: 7.125 + -7.125 = 0.000 0.000 + x = 9.785991263 + -7.125 x = 9.785991263 + -7.125 Combine like terms: 9.785991263 + -7.125 = 2.660991263 x = 2.660991263 Simplifying x = 2.660991263

Subproblem 2

x + 7.125 = -9.785991263 Simplifying x + 7.125 = -9.785991263 Reorder the terms: 7.125 + x = -9.785991263 Solving 7.125 + x = -9.785991263 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.125' to each side of the equation. 7.125 + -7.125 + x = -9.785991263 + -7.125 Combine like terms: 7.125 + -7.125 = 0.000 0.000 + x = -9.785991263 + -7.125 x = -9.785991263 + -7.125 Combine like terms: -9.785991263 + -7.125 = -16.910991263 x = -16.910991263 Simplifying x = -16.910991263

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.660991263, -16.910991263}

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