2x^2-3x-140=0

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Solution for 2x^2-3x-140=0 equation:


Simplifying
2x2 + -3x + -140 = 0

Reorder the terms:
-140 + -3x + 2x2 = 0

Solving
-140 + -3x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-70 + -1.5x + x2 = 0

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -1.5x + 70 + x2 = 0 + 70

Reorder the terms:
-70 + 70 + -1.5x + x2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -1.5x + x2 = 0 + 70
-1.5x + x2 = 0 + 70

Combine like terms: 0 + 70 = 70
-1.5x + x2 = 70

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 70 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 70 + 0.5625

Combine like terms: 70 + 0.5625 = 70.5625
0.5625 + -1.5x + x2 = 70.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 70.5625

Calculate the square root of the right side: 8.400148808

Break this problem into two subproblems by setting 
(x + -0.75) equal to 8.400148808 and -8.400148808.

Subproblem 1

x + -0.75 = 8.400148808 Simplifying x + -0.75 = 8.400148808 Reorder the terms: -0.75 + x = 8.400148808 Solving -0.75 + x = 8.400148808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 8.400148808 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 8.400148808 + 0.75 x = 8.400148808 + 0.75 Combine like terms: 8.400148808 + 0.75 = 9.150148808 x = 9.150148808 Simplifying x = 9.150148808

Subproblem 2

x + -0.75 = -8.400148808 Simplifying x + -0.75 = -8.400148808 Reorder the terms: -0.75 + x = -8.400148808 Solving -0.75 + x = -8.400148808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -8.400148808 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -8.400148808 + 0.75 x = -8.400148808 + 0.75 Combine like terms: -8.400148808 + 0.75 = -7.650148808 x = -7.650148808 Simplifying x = -7.650148808

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.150148808, -7.650148808}

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