5x^2-7x=100

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Solution for 5x^2-7x=100 equation:


Simplifying
5x2 + -7x = 100

Reorder the terms:
-7x + 5x2 = 100

Solving
-7x + 5x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + -7x + 5x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -7x + 5x2 = 0

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

Divide each side by '5'.
-20 + -1.4x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -1.4x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -1.4x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1.4x + x2 = 0 + 20
-1.4x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1.4x + x2 = 20

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 20 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 20 + 0.49

Combine like terms: 20 + 0.49 = 20.49
0.49 + -1.4x + x2 = 20.49

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 20.49

Calculate the square root of the right side: 4.526588119

Break this problem into two subproblems by setting 
(x + -0.7) equal to 4.526588119 and -4.526588119.

Subproblem 1

x + -0.7 = 4.526588119 Simplifying x + -0.7 = 4.526588119 Reorder the terms: -0.7 + x = 4.526588119 Solving -0.7 + x = 4.526588119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 4.526588119 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 4.526588119 + 0.7 x = 4.526588119 + 0.7 Combine like terms: 4.526588119 + 0.7 = 5.226588119 x = 5.226588119 Simplifying x = 5.226588119

Subproblem 2

x + -0.7 = -4.526588119 Simplifying x + -0.7 = -4.526588119 Reorder the terms: -0.7 + x = -4.526588119 Solving -0.7 + x = -4.526588119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -4.526588119 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -4.526588119 + 0.7 x = -4.526588119 + 0.7 Combine like terms: -4.526588119 + 0.7 = -3.826588119 x = -3.826588119 Simplifying x = -3.826588119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.226588119, -3.826588119}

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