x^2+5x+12=70

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Solution for x^2+5x+12=70 equation:


Simplifying
x2 + 5x + 12 = 70

Reorder the terms:
12 + 5x + x2 = 70

Solving
12 + 5x + x2 = 70

Solving for variable 'x'.

Reorder the terms:
12 + -70 + 5x + x2 = 70 + -70

Combine like terms: 12 + -70 = -58
-58 + 5x + x2 = 70 + -70

Combine like terms: 70 + -70 = 0
-58 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '58' to each side of the equation.
-58 + 5x + 58 + x2 = 0 + 58

Reorder the terms:
-58 + 58 + 5x + x2 = 0 + 58

Combine like terms: -58 + 58 = 0
0 + 5x + x2 = 0 + 58
5x + x2 = 0 + 58

Combine like terms: 0 + 58 = 58
5x + x2 = 58

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 58 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 58 + 6.25

Combine like terms: 58 + 6.25 = 64.25
6.25 + 5x + x2 = 64.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 64.25

Calculate the square root of the right side: 8.015609771

Break this problem into two subproblems by setting 
(x + 2.5) equal to 8.015609771 and -8.015609771.

Subproblem 1

x + 2.5 = 8.015609771 Simplifying x + 2.5 = 8.015609771 Reorder the terms: 2.5 + x = 8.015609771 Solving 2.5 + x = 8.015609771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 8.015609771 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 8.015609771 + -2.5 x = 8.015609771 + -2.5 Combine like terms: 8.015609771 + -2.5 = 5.515609771 x = 5.515609771 Simplifying x = 5.515609771

Subproblem 2

x + 2.5 = -8.015609771 Simplifying x + 2.5 = -8.015609771 Reorder the terms: 2.5 + x = -8.015609771 Solving 2.5 + x = -8.015609771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -8.015609771 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -8.015609771 + -2.5 x = -8.015609771 + -2.5 Combine like terms: -8.015609771 + -2.5 = -10.515609771 x = -10.515609771 Simplifying x = -10.515609771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.515609771, -10.515609771}

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