5x+x^2=15*6

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Solution for 5x+x^2=15*6 equation:


Simplifying
5x + x2 = 15 * 6

Multiply 15 * 6
5x + x2 = 90

Solving
5x + x2 = 90

Solving for variable 'x'.

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

Combine like terms: 90 + -90 = 0
-90 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 5x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 5x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 5x + x2 = 0 + 90
5x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
5x + x2 = 90

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 = 90 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 90 + 6.25

Combine like terms: 90 + 6.25 = 96.25
6.25 + 5x + x2 = 96.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 96.25

Calculate the square root of the right side: 9.810708435

Break this problem into two subproblems by setting 
(x + 2.5) equal to 9.810708435 and -9.810708435.

Subproblem 1

x + 2.5 = 9.810708435 Simplifying x + 2.5 = 9.810708435 Reorder the terms: 2.5 + x = 9.810708435 Solving 2.5 + x = 9.810708435 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 = 9.810708435 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 9.810708435 + -2.5 x = 9.810708435 + -2.5 Combine like terms: 9.810708435 + -2.5 = 7.310708435 x = 7.310708435 Simplifying x = 7.310708435

Subproblem 2

x + 2.5 = -9.810708435 Simplifying x + 2.5 = -9.810708435 Reorder the terms: 2.5 + x = -9.810708435 Solving 2.5 + x = -9.810708435 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 = -9.810708435 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -9.810708435 + -2.5 x = -9.810708435 + -2.5 Combine like terms: -9.810708435 + -2.5 = -12.310708435 x = -12.310708435 Simplifying x = -12.310708435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.310708435, -12.310708435}

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