x*x-80*x+75=0

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Solution for x*x-80*x+75=0 equation:


Simplifying
x * x + -80x + 75 = 0

Multiply x * x
x2 + -80x + 75 = 0

Reorder the terms:
75 + -80x + x2 = 0

Solving
75 + -80x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-75' to each side of the equation.
75 + -80x + -75 + x2 = 0 + -75

Reorder the terms:
75 + -75 + -80x + x2 = 0 + -75

Combine like terms: 75 + -75 = 0
0 + -80x + x2 = 0 + -75
-80x + x2 = 0 + -75

Combine like terms: 0 + -75 = -75
-80x + x2 = -75

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = -75 + 1600

Reorder the terms:
1600 + -80x + x2 = -75 + 1600

Combine like terms: -75 + 1600 = 1525
1600 + -80x + x2 = 1525

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1525

Calculate the square root of the right side: 39.05124838

Break this problem into two subproblems by setting 
(x + -40) equal to 39.05124838 and -39.05124838.

Subproblem 1

x + -40 = 39.05124838 Simplifying x + -40 = 39.05124838 Reorder the terms: -40 + x = 39.05124838 Solving -40 + x = 39.05124838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 39.05124838 + 40 Combine like terms: -40 + 40 = 0 0 + x = 39.05124838 + 40 x = 39.05124838 + 40 Combine like terms: 39.05124838 + 40 = 79.05124838 x = 79.05124838 Simplifying x = 79.05124838

Subproblem 2

x + -40 = -39.05124838 Simplifying x + -40 = -39.05124838 Reorder the terms: -40 + x = -39.05124838 Solving -40 + x = -39.05124838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -39.05124838 + 40 Combine like terms: -40 + 40 = 0 0 + x = -39.05124838 + 40 x = -39.05124838 + 40 Combine like terms: -39.05124838 + 40 = 0.94875162 x = 0.94875162 Simplifying x = 0.94875162

Solution

The solution to the problem is based on the solutions from the subproblems. x = {79.05124838, 0.94875162}

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