2x^2-5x=146

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Solution for 2x^2-5x=146 equation:


Simplifying
2x2 + -5x = 146

Reorder the terms:
-5x + 2x2 = 146

Solving
-5x + 2x2 = 146

Solving for variable 'x'.

Reorder the terms:
-146 + -5x + 2x2 = 146 + -146

Combine like terms: 146 + -146 = 0
-146 + -5x + 2x2 = 0

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

Divide each side by '2'.
-73 + -2.5x + x2 = 0

Move the constant term to the right:

Add '73' to each side of the equation.
-73 + -2.5x + 73 + x2 = 0 + 73

Reorder the terms:
-73 + 73 + -2.5x + x2 = 0 + 73

Combine like terms: -73 + 73 = 0
0 + -2.5x + x2 = 0 + 73
-2.5x + x2 = 0 + 73

Combine like terms: 0 + 73 = 73
-2.5x + x2 = 73

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 = 73 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 73 + 1.5625

Combine like terms: 73 + 1.5625 = 74.5625
1.5625 + -2.5x + x2 = 74.5625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 74.5625

Calculate the square root of the right side: 8.63495802

Break this problem into two subproblems by setting 
(x + -1.25) equal to 8.63495802 and -8.63495802.

Subproblem 1

x + -1.25 = 8.63495802 Simplifying x + -1.25 = 8.63495802 Reorder the terms: -1.25 + x = 8.63495802 Solving -1.25 + x = 8.63495802 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 = 8.63495802 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 8.63495802 + 1.25 x = 8.63495802 + 1.25 Combine like terms: 8.63495802 + 1.25 = 9.88495802 x = 9.88495802 Simplifying x = 9.88495802

Subproblem 2

x + -1.25 = -8.63495802 Simplifying x + -1.25 = -8.63495802 Reorder the terms: -1.25 + x = -8.63495802 Solving -1.25 + x = -8.63495802 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 = -8.63495802 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -8.63495802 + 1.25 x = -8.63495802 + 1.25 Combine like terms: -8.63495802 + 1.25 = -7.38495802 x = -7.38495802 Simplifying x = -7.38495802

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.88495802, -7.38495802}

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