2x^2-7x-74=0

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Solution for 2x^2-7x-74=0 equation:


Simplifying
2x2 + -7x + -74 = 0

Reorder the terms:
-74 + -7x + 2x2 = 0

Solving
-74 + -7x + 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'.
-37 + -3.5x + x2 = 0

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + -3.5x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + -3.5x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + -3.5x + x2 = 0 + 37
-3.5x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
-3.5x + x2 = 37

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 = 37 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 37 + 3.0625

Combine like terms: 37 + 3.0625 = 40.0625
3.0625 + -3.5x + x2 = 40.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 40.0625

Calculate the square root of the right side: 6.329494451

Break this problem into two subproblems by setting 
(x + -1.75) equal to 6.329494451 and -6.329494451.

Subproblem 1

x + -1.75 = 6.329494451 Simplifying x + -1.75 = 6.329494451 Reorder the terms: -1.75 + x = 6.329494451 Solving -1.75 + x = 6.329494451 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 = 6.329494451 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 6.329494451 + 1.75 x = 6.329494451 + 1.75 Combine like terms: 6.329494451 + 1.75 = 8.079494451 x = 8.079494451 Simplifying x = 8.079494451

Subproblem 2

x + -1.75 = -6.329494451 Simplifying x + -1.75 = -6.329494451 Reorder the terms: -1.75 + x = -6.329494451 Solving -1.75 + x = -6.329494451 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 = -6.329494451 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -6.329494451 + 1.75 x = -6.329494451 + 1.75 Combine like terms: -6.329494451 + 1.75 = -4.579494451 x = -4.579494451 Simplifying x = -4.579494451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.079494451, -4.579494451}

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