5x^2-10x-25=47

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Solution for 5x^2-10x-25=47 equation:


Simplifying
5x2 + -10x + -25 = 47

Reorder the terms:
-25 + -10x + 5x2 = 47

Solving
-25 + -10x + 5x2 = 47

Solving for variable 'x'.

Reorder the terms:
-25 + -47 + -10x + 5x2 = 47 + -47

Combine like terms: -25 + -47 = -72
-72 + -10x + 5x2 = 47 + -47

Combine like terms: 47 + -47 = 0
-72 + -10x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-14.4 + -2x + x2 = 0

Move the constant term to the right:

Add '14.4' to each side of the equation.
-14.4 + -2x + 14.4 + x2 = 0 + 14.4

Reorder the terms:
-14.4 + 14.4 + -2x + x2 = 0 + 14.4

Combine like terms: -14.4 + 14.4 = 0.0
0.0 + -2x + x2 = 0 + 14.4
-2x + x2 = 0 + 14.4

Combine like terms: 0 + 14.4 = 14.4
-2x + x2 = 14.4

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 14.4 + 1

Reorder the terms:
1 + -2x + x2 = 14.4 + 1

Combine like terms: 14.4 + 1 = 15.4
1 + -2x + x2 = 15.4

Factor a perfect square on the left side:
(x + -1)(x + -1) = 15.4

Calculate the square root of the right side: 3.924283374

Break this problem into two subproblems by setting 
(x + -1) equal to 3.924283374 and -3.924283374.

Subproblem 1

x + -1 = 3.924283374 Simplifying x + -1 = 3.924283374 Reorder the terms: -1 + x = 3.924283374 Solving -1 + x = 3.924283374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.924283374 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.924283374 + 1 x = 3.924283374 + 1 Combine like terms: 3.924283374 + 1 = 4.924283374 x = 4.924283374 Simplifying x = 4.924283374

Subproblem 2

x + -1 = -3.924283374 Simplifying x + -1 = -3.924283374 Reorder the terms: -1 + x = -3.924283374 Solving -1 + x = -3.924283374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.924283374 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.924283374 + 1 x = -3.924283374 + 1 Combine like terms: -3.924283374 + 1 = -2.924283374 x = -2.924283374 Simplifying x = -2.924283374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.924283374, -2.924283374}

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