x^2-5.2x=42.24

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Solution for x^2-5.2x=42.24 equation:


Simplifying
x2 + -5.2x = 42.24

Reorder the terms:
-5.2x + x2 = 42.24

Solving
-5.2x + x2 = 42.24

Solving for variable 'x'.

Reorder the terms:
-42.24 + -5.2x + x2 = 42.24 + -42.24

Combine like terms: 42.24 + -42.24 = 0.00
-42.24 + -5.2x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '42.24' to each side of the equation.
-42.24 + -5.2x + 42.24 + x2 = 0.00 + 42.24

Reorder the terms:
-42.24 + 42.24 + -5.2x + x2 = 0.00 + 42.24

Combine like terms: -42.24 + 42.24 = 0.00
0.00 + -5.2x + x2 = 0.00 + 42.24
-5.2x + x2 = 0.00 + 42.24

Combine like terms: 0.00 + 42.24 = 42.24
-5.2x + x2 = 42.24

The x term is -5.2x.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2x + 6.76 + x2 = 42.24 + 6.76

Reorder the terms:
6.76 + -5.2x + x2 = 42.24 + 6.76

Combine like terms: 42.24 + 6.76 = 49
6.76 + -5.2x + x2 = 49

Factor a perfect square on the left side:
(x + -2.6)(x + -2.6) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + -2.6) equal to 7 and -7.

Subproblem 1

x + -2.6 = 7 Simplifying x + -2.6 = 7 Reorder the terms: -2.6 + x = 7 Solving -2.6 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = 7 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = 7 + 2.6 x = 7 + 2.6 Combine like terms: 7 + 2.6 = 9.6 x = 9.6 Simplifying x = 9.6

Subproblem 2

x + -2.6 = -7 Simplifying x + -2.6 = -7 Reorder the terms: -2.6 + x = -7 Solving -2.6 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = -7 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = -7 + 2.6 x = -7 + 2.6 Combine like terms: -7 + 2.6 = -4.4 x = -4.4 Simplifying x = -4.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.6, -4.4}

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