5x^2-3x-10=15

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Solution for 5x^2-3x-10=15 equation:


Simplifying
5x2 + -3x + -10 = 15

Reorder the terms:
-10 + -3x + 5x2 = 15

Solving
-10 + -3x + 5x2 = 15

Solving for variable 'x'.

Reorder the terms:
-10 + -15 + -3x + 5x2 = 15 + -15

Combine like terms: -10 + -15 = -25
-25 + -3x + 5x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-25 + -3x + 5x2 = 0

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

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

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.6x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.6x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.6x + x2 = 0 + 5
-0.6x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.6x + x2 = 5

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 = 5 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 5 + 0.09

Combine like terms: 5 + 0.09 = 5.09
0.09 + -0.6x + x2 = 5.09

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 5.09

Calculate the square root of the right side: 2.256102835

Break this problem into two subproblems by setting 
(x + -0.3) equal to 2.256102835 and -2.256102835.

Subproblem 1

x + -0.3 = 2.256102835 Simplifying x + -0.3 = 2.256102835 Reorder the terms: -0.3 + x = 2.256102835 Solving -0.3 + x = 2.256102835 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 = 2.256102835 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 2.256102835 + 0.3 x = 2.256102835 + 0.3 Combine like terms: 2.256102835 + 0.3 = 2.556102835 x = 2.556102835 Simplifying x = 2.556102835

Subproblem 2

x + -0.3 = -2.256102835 Simplifying x + -0.3 = -2.256102835 Reorder the terms: -0.3 + x = -2.256102835 Solving -0.3 + x = -2.256102835 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 = -2.256102835 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -2.256102835 + 0.3 x = -2.256102835 + 0.3 Combine like terms: -2.256102835 + 0.3 = -1.956102835 x = -1.956102835 Simplifying x = -1.956102835

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.556102835, -1.956102835}

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