9x^2-6+5x-8x^2-7=

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Solution for 9x^2-6+5x-8x^2-7= equation:


Simplifying
9x2 + -6 + 5x + -8x2 + -7 = 0

Reorder the terms:
-6 + -7 + 5x + 9x2 + -8x2 = 0

Combine like terms: -6 + -7 = -13
-13 + 5x + 9x2 + -8x2 = 0

Combine like terms: 9x2 + -8x2 = 1x2
-13 + 5x + 1x2 = 0

Solving
-13 + 5x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 5x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 5x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 5x + x2 = 0 + 13
5x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
5x + x2 = 13

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 = 13 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 13 + 6.25

Combine like terms: 13 + 6.25 = 19.25
6.25 + 5x + x2 = 19.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 19.25

Calculate the square root of the right side: 4.387482194

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.387482194 and -4.387482194.

Subproblem 1

x + 2.5 = 4.387482194 Simplifying x + 2.5 = 4.387482194 Reorder the terms: 2.5 + x = 4.387482194 Solving 2.5 + x = 4.387482194 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 = 4.387482194 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.387482194 + -2.5 x = 4.387482194 + -2.5 Combine like terms: 4.387482194 + -2.5 = 1.887482194 x = 1.887482194 Simplifying x = 1.887482194

Subproblem 2

x + 2.5 = -4.387482194 Simplifying x + 2.5 = -4.387482194 Reorder the terms: 2.5 + x = -4.387482194 Solving 2.5 + x = -4.387482194 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 = -4.387482194 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.387482194 + -2.5 x = -4.387482194 + -2.5 Combine like terms: -4.387482194 + -2.5 = -6.887482194 x = -6.887482194 Simplifying x = -6.887482194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.887482194, -6.887482194}

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