x^2-7+4x+5=90

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Solution for x^2-7+4x+5=90 equation:


Simplifying
x2 + -7 + 4x + 5 = 90

Reorder the terms:
-7 + 5 + 4x + x2 = 90

Combine like terms: -7 + 5 = -2
-2 + 4x + x2 = 90

Solving
-2 + 4x + x2 = 90

Solving for variable 'x'.

Reorder the terms:
-2 + -90 + 4x + x2 = 90 + -90

Combine like terms: -2 + -90 = -92
-92 + 4x + x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-92 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '92' to each side of the equation.
-92 + 4x + 92 + x2 = 0 + 92

Reorder the terms:
-92 + 92 + 4x + x2 = 0 + 92

Combine like terms: -92 + 92 = 0
0 + 4x + x2 = 0 + 92
4x + x2 = 0 + 92

Combine like terms: 0 + 92 = 92
4x + x2 = 92

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 92 + 4

Reorder the terms:
4 + 4x + x2 = 92 + 4

Combine like terms: 92 + 4 = 96
4 + 4x + x2 = 96

Factor a perfect square on the left side:
(x + 2)(x + 2) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(x + 2) equal to 9.797958971 and -9.797958971.

Subproblem 1

x + 2 = 9.797958971 Simplifying x + 2 = 9.797958971 Reorder the terms: 2 + x = 9.797958971 Solving 2 + x = 9.797958971 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 9.797958971 + -2 Combine like terms: 2 + -2 = 0 0 + x = 9.797958971 + -2 x = 9.797958971 + -2 Combine like terms: 9.797958971 + -2 = 7.797958971 x = 7.797958971 Simplifying x = 7.797958971

Subproblem 2

x + 2 = -9.797958971 Simplifying x + 2 = -9.797958971 Reorder the terms: 2 + x = -9.797958971 Solving 2 + x = -9.797958971 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -9.797958971 + -2 Combine like terms: 2 + -2 = 0 0 + x = -9.797958971 + -2 x = -9.797958971 + -2 Combine like terms: -9.797958971 + -2 = -11.797958971 x = -11.797958971 Simplifying x = -11.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.797958971, -11.797958971}

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