x^2+10x=65.25

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Solution for x^2+10x=65.25 equation:


Simplifying
x2 + 10x = 65.25

Reorder the terms:
10x + x2 = 65.25

Solving
10x + x2 = 65.25

Solving for variable 'x'.

Reorder the terms:
-65.25 + 10x + x2 = 65.25 + -65.25

Combine like terms: 65.25 + -65.25 = 0.00
-65.25 + 10x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '65.25' to each side of the equation.
-65.25 + 10x + 65.25 + x2 = 0.00 + 65.25

Reorder the terms:
-65.25 + 65.25 + 10x + x2 = 0.00 + 65.25

Combine like terms: -65.25 + 65.25 = 0.00
0.00 + 10x + x2 = 0.00 + 65.25
10x + x2 = 0.00 + 65.25

Combine like terms: 0.00 + 65.25 = 65.25
10x + x2 = 65.25

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 65.25 + 25

Reorder the terms:
25 + 10x + x2 = 65.25 + 25

Combine like terms: 65.25 + 25 = 90.25
25 + 10x + x2 = 90.25

Factor a perfect square on the left side:
(x + 5)(x + 5) = 90.25

Calculate the square root of the right side: 9.5

Break this problem into two subproblems by setting 
(x + 5) equal to 9.5 and -9.5.

Subproblem 1

x + 5 = 9.5 Simplifying x + 5 = 9.5 Reorder the terms: 5 + x = 9.5 Solving 5 + x = 9.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 9.5 + -5 Combine like terms: 5 + -5 = 0 0 + x = 9.5 + -5 x = 9.5 + -5 Combine like terms: 9.5 + -5 = 4.5 x = 4.5 Simplifying x = 4.5

Subproblem 2

x + 5 = -9.5 Simplifying x + 5 = -9.5 Reorder the terms: 5 + x = -9.5 Solving 5 + x = -9.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -9.5 + -5 Combine like terms: 5 + -5 = 0 0 + x = -9.5 + -5 x = -9.5 + -5 Combine like terms: -9.5 + -5 = -14.5 x = -14.5 Simplifying x = -14.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.5, -14.5}

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