2x^2-25x=80

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Solution for 2x^2-25x=80 equation:


Simplifying
2x2 + -25x = 80

Reorder the terms:
-25x + 2x2 = 80

Solving
-25x + 2x2 = 80

Solving for variable 'x'.

Reorder the terms:
-80 + -25x + 2x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + -25x + 2x2 = 0

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

Divide each side by '2'.
-40 + -12.5x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -12.5x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -12.5x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -12.5x + x2 = 0 + 40
-12.5x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-12.5x + x2 = 40

The x term is -12.5x.  Take half its coefficient (-6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
-12.5x + 39.0625 + x2 = 40 + 39.0625

Reorder the terms:
39.0625 + -12.5x + x2 = 40 + 39.0625

Combine like terms: 40 + 39.0625 = 79.0625
39.0625 + -12.5x + x2 = 79.0625

Factor a perfect square on the left side:
(x + -6.25)(x + -6.25) = 79.0625

Calculate the square root of the right side: 8.891709622

Break this problem into two subproblems by setting 
(x + -6.25) equal to 8.891709622 and -8.891709622.

Subproblem 1

x + -6.25 = 8.891709622 Simplifying x + -6.25 = 8.891709622 Reorder the terms: -6.25 + x = 8.891709622 Solving -6.25 + x = 8.891709622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = 8.891709622 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = 8.891709622 + 6.25 x = 8.891709622 + 6.25 Combine like terms: 8.891709622 + 6.25 = 15.141709622 x = 15.141709622 Simplifying x = 15.141709622

Subproblem 2

x + -6.25 = -8.891709622 Simplifying x + -6.25 = -8.891709622 Reorder the terms: -6.25 + x = -8.891709622 Solving -6.25 + x = -8.891709622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = -8.891709622 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = -8.891709622 + 6.25 x = -8.891709622 + 6.25 Combine like terms: -8.891709622 + 6.25 = -2.641709622 x = -2.641709622 Simplifying x = -2.641709622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.141709622, -2.641709622}

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