5x^2-3x-7=5

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Solution for 5x^2-3x-7=5 equation:


Simplifying
5x2 + -3x + -7 = 5

Reorder the terms:
-7 + -3x + 5x2 = 5

Solving
-7 + -3x + 5x2 = 5

Solving for variable 'x'.

Reorder the terms:
-7 + -5 + -3x + 5x2 = 5 + -5

Combine like terms: -7 + -5 = -12
-12 + -3x + 5x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-12 + -3x + 5x2 = 0

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

Divide each side by '5'.
-2.4 + -0.6x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -0.6x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -0.6x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -0.6x + x2 = 0 + 2.4
-0.6x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-0.6x + x2 = 2.4

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 2.4 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 2.4 + 0.09

Combine like terms: 2.4 + 0.09 = 2.49
0.09 + -0.6x + x2 = 2.49

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 2.49

Calculate the square root of the right side: 1.577973384

Break this problem into two subproblems by setting 
(x + -0.3) equal to 1.577973384 and -1.577973384.

Subproblem 1

x + -0.3 = 1.577973384 Simplifying x + -0.3 = 1.577973384 Reorder the terms: -0.3 + x = 1.577973384 Solving -0.3 + x = 1.577973384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 1.577973384 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 1.577973384 + 0.3 x = 1.577973384 + 0.3 Combine like terms: 1.577973384 + 0.3 = 1.877973384 x = 1.877973384 Simplifying x = 1.877973384

Subproblem 2

x + -0.3 = -1.577973384 Simplifying x + -0.3 = -1.577973384 Reorder the terms: -0.3 + x = -1.577973384 Solving -0.3 + x = -1.577973384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -1.577973384 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -1.577973384 + 0.3 x = -1.577973384 + 0.3 Combine like terms: -1.577973384 + 0.3 = -1.277973384 x = -1.277973384 Simplifying x = -1.277973384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.877973384, -1.277973384}

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