20x^2+35x-10=8

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Solution for 20x^2+35x-10=8 equation:


Simplifying
20x2 + 35x + -10 = 8

Reorder the terms:
-10 + 35x + 20x2 = 8

Solving
-10 + 35x + 20x2 = 8

Solving for variable 'x'.

Reorder the terms:
-10 + -8 + 35x + 20x2 = 8 + -8

Combine like terms: -10 + -8 = -18
-18 + 35x + 20x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-18 + 35x + 20x2 = 0

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

Divide each side by '20'.
-0.9 + 1.75x + x2 = 0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + 1.75x + 0.9 + x2 = 0 + 0.9

Reorder the terms:
-0.9 + 0.9 + 1.75x + x2 = 0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + 1.75x + x2 = 0 + 0.9
1.75x + x2 = 0 + 0.9

Combine like terms: 0 + 0.9 = 0.9
1.75x + x2 = 0.9

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 0.9 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 0.9 + 0.765625

Combine like terms: 0.9 + 0.765625 = 1.665625
0.765625 + 1.75x + x2 = 1.665625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 1.665625

Calculate the square root of the right side: 1.29059095

Break this problem into two subproblems by setting 
(x + 0.875) equal to 1.29059095 and -1.29059095.

Subproblem 1

x + 0.875 = 1.29059095 Simplifying x + 0.875 = 1.29059095 Reorder the terms: 0.875 + x = 1.29059095 Solving 0.875 + x = 1.29059095 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 1.29059095 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 1.29059095 + -0.875 x = 1.29059095 + -0.875 Combine like terms: 1.29059095 + -0.875 = 0.41559095 x = 0.41559095 Simplifying x = 0.41559095

Subproblem 2

x + 0.875 = -1.29059095 Simplifying x + 0.875 = -1.29059095 Reorder the terms: 0.875 + x = -1.29059095 Solving 0.875 + x = -1.29059095 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -1.29059095 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -1.29059095 + -0.875 x = -1.29059095 + -0.875 Combine like terms: -1.29059095 + -0.875 = -2.16559095 x = -2.16559095 Simplifying x = -2.16559095

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.41559095, -2.16559095}

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