2x^2-7x=12.25

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Solution for 2x^2-7x=12.25 equation:


Simplifying
2x2 + -7x = 12.25

Reorder the terms:
-7x + 2x2 = 12.25

Solving
-7x + 2x2 = 12.25

Solving for variable 'x'.

Reorder the terms:
-12.25 + -7x + 2x2 = 12.25 + -12.25

Combine like terms: 12.25 + -12.25 = 0.00
-12.25 + -7x + 2x2 = 0.00

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

Divide each side by '2'.
-6.125 + -3.5x + x2 = 0.00

Move the constant term to the right:

Add '6.125' to each side of the equation.
-6.125 + -3.5x + 6.125 + x2 = 0.00 + 6.125

Reorder the terms:
-6.125 + 6.125 + -3.5x + x2 = 0.00 + 6.125

Combine like terms: -6.125 + 6.125 = 0.000
0.000 + -3.5x + x2 = 0.00 + 6.125
-3.5x + x2 = 0.00 + 6.125

Combine like terms: 0.00 + 6.125 = 6.125
-3.5x + x2 = 6.125

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 6.125 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 6.125 + 3.0625

Combine like terms: 6.125 + 3.0625 = 9.1875
3.0625 + -3.5x + x2 = 9.1875

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 9.1875

Calculate the square root of the right side: 3.031088913

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.031088913 and -3.031088913.

Subproblem 1

x + -1.75 = 3.031088913 Simplifying x + -1.75 = 3.031088913 Reorder the terms: -1.75 + x = 3.031088913 Solving -1.75 + x = 3.031088913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.031088913 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.031088913 + 1.75 x = 3.031088913 + 1.75 Combine like terms: 3.031088913 + 1.75 = 4.781088913 x = 4.781088913 Simplifying x = 4.781088913

Subproblem 2

x + -1.75 = -3.031088913 Simplifying x + -1.75 = -3.031088913 Reorder the terms: -1.75 + x = -3.031088913 Solving -1.75 + x = -3.031088913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.031088913 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.031088913 + 1.75 x = -3.031088913 + 1.75 Combine like terms: -3.031088913 + 1.75 = -1.281088913 x = -1.281088913 Simplifying x = -1.281088913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.781088913, -1.281088913}

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