1.25x^2-10x+15=0

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Solution for 1.25x^2-10x+15=0 equation:


Simplifying
1.25x2 + -10x + 15 = 0

Reorder the terms:
15 + -10x + 1.25x2 = 0

Solving
15 + -10x + 1.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.25'.
12 + -8x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -8x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -8x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -8x + x2 = 0 + -12
-8x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-8x + x2 = -12

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -12 + 16

Reorder the terms:
16 + -8x + x2 = -12 + 16

Combine like terms: -12 + 16 = 4
16 + -8x + x2 = 4

Factor a perfect square on the left side:
(x + -4)(x + -4) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -4) equal to 2 and -2.

Subproblem 1

x + -4 = 2 Simplifying x + -4 = 2 Reorder the terms: -4 + x = 2 Solving -4 + x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 2 + 4 Combine like terms: -4 + 4 = 0 0 + x = 2 + 4 x = 2 + 4 Combine like terms: 2 + 4 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + -4 = -2 Simplifying x + -4 = -2 Reorder the terms: -4 + x = -2 Solving -4 + x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -2 + 4 Combine like terms: -4 + 4 = 0 0 + x = -2 + 4 x = -2 + 4 Combine like terms: -2 + 4 = 2 x = 2 Simplifying x = 2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, 2}

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