(x+4)(x-7)=70

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Solution for (x+4)(x-7)=70 equation:


Simplifying
(x + 4)(x + -7) = 70

Reorder the terms:
(4 + x)(x + -7) = 70

Reorder the terms:
(4 + x)(-7 + x) = 70

Multiply (4 + x) * (-7 + x)
(4(-7 + x) + x(-7 + x)) = 70
((-7 * 4 + x * 4) + x(-7 + x)) = 70
((-28 + 4x) + x(-7 + x)) = 70
(-28 + 4x + (-7 * x + x * x)) = 70
(-28 + 4x + (-7x + x2)) = 70

Combine like terms: 4x + -7x = -3x
(-28 + -3x + x2) = 70

Solving
-28 + -3x + x2 = 70

Solving for variable 'x'.

Reorder the terms:
-28 + -70 + -3x + x2 = 70 + -70

Combine like terms: -28 + -70 = -98
-98 + -3x + x2 = 70 + -70

Combine like terms: 70 + -70 = 0
-98 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + -3x + 98 + x2 = 0 + 98

Reorder the terms:
-98 + 98 + -3x + x2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + -3x + x2 = 0 + 98
-3x + x2 = 0 + 98

Combine like terms: 0 + 98 = 98
-3x + x2 = 98

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 98 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 98 + 2.25

Combine like terms: 98 + 2.25 = 100.25
2.25 + -3x + x2 = 100.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(x + -1.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

x + -1.5 = 10.012492197 Simplifying x + -1.5 = 10.012492197 Reorder the terms: -1.5 + x = 10.012492197 Solving -1.5 + x = 10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 10.012492197 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 10.012492197 + 1.5 x = 10.012492197 + 1.5 Combine like terms: 10.012492197 + 1.5 = 11.512492197 x = 11.512492197 Simplifying x = 11.512492197

Subproblem 2

x + -1.5 = -10.012492197 Simplifying x + -1.5 = -10.012492197 Reorder the terms: -1.5 + x = -10.012492197 Solving -1.5 + x = -10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -10.012492197 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -10.012492197 + 1.5 x = -10.012492197 + 1.5 Combine like terms: -10.012492197 + 1.5 = -8.512492197 x = -8.512492197 Simplifying x = -8.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.512492197, -8.512492197}

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