0=2x^2-5x-70

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Solution for 0=2x^2-5x-70 equation:


Simplifying
0 = 2x2 + -5x + -70

Reorder the terms:
0 = -70 + -5x + 2x2

Solving
0 = -70 + -5x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 70 = 70
70 + 5x + -2x2 = -70 + -5x + 2x2 + 70 + 5x + -2x2

Reorder the terms:
70 + 5x + -2x2 = -70 + 70 + -5x + 5x + 2x2 + -2x2

Combine like terms: -70 + 70 = 0
70 + 5x + -2x2 = 0 + -5x + 5x + 2x2 + -2x2
70 + 5x + -2x2 = -5x + 5x + 2x2 + -2x2

Combine like terms: -5x + 5x = 0
70 + 5x + -2x2 = 0 + 2x2 + -2x2
70 + 5x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
70 + 5x + -2x2 = 0

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

Divide each side by '-2'.
-35 + -2.5x + x2 = 0

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -2.5x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + -2.5x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -2.5x + x2 = 0 + 35
-2.5x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
-2.5x + x2 = 35

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 35 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 35 + 1.5625

Combine like terms: 35 + 1.5625 = 36.5625
1.5625 + -2.5x + x2 = 36.5625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 36.5625

Calculate the square root of the right side: 6.046693311

Break this problem into two subproblems by setting 
(x + -1.25) equal to 6.046693311 and -6.046693311.

Subproblem 1

x + -1.25 = 6.046693311 Simplifying x + -1.25 = 6.046693311 Reorder the terms: -1.25 + x = 6.046693311 Solving -1.25 + x = 6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 6.046693311 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 6.046693311 + 1.25 x = 6.046693311 + 1.25 Combine like terms: 6.046693311 + 1.25 = 7.296693311 x = 7.296693311 Simplifying x = 7.296693311

Subproblem 2

x + -1.25 = -6.046693311 Simplifying x + -1.25 = -6.046693311 Reorder the terms: -1.25 + x = -6.046693311 Solving -1.25 + x = -6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -6.046693311 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -6.046693311 + 1.25 x = -6.046693311 + 1.25 Combine like terms: -6.046693311 + 1.25 = -4.796693311 x = -4.796693311 Simplifying x = -4.796693311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.296693311, -4.796693311}

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