5x^2+8x-35=0

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Solution for 5x^2+8x-35=0 equation:


Simplifying
5x2 + 8x + -35 = 0

Reorder the terms:
-35 + 8x + 5x2 = 0

Solving
-35 + 8x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-7 + 1.6x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 1.6x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 1.6x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 1.6x + x2 = 0 + 7
1.6x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
1.6x + x2 = 7

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 7 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 7 + 0.64

Combine like terms: 7 + 0.64 = 7.64
0.64 + 1.6x + x2 = 7.64

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 7.64

Calculate the square root of the right side: 2.764054992

Break this problem into two subproblems by setting 
(x + 0.8) equal to 2.764054992 and -2.764054992.

Subproblem 1

x + 0.8 = 2.764054992 Simplifying x + 0.8 = 2.764054992 Reorder the terms: 0.8 + x = 2.764054992 Solving 0.8 + x = 2.764054992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 2.764054992 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 2.764054992 + -0.8 x = 2.764054992 + -0.8 Combine like terms: 2.764054992 + -0.8 = 1.964054992 x = 1.964054992 Simplifying x = 1.964054992

Subproblem 2

x + 0.8 = -2.764054992 Simplifying x + 0.8 = -2.764054992 Reorder the terms: 0.8 + x = -2.764054992 Solving 0.8 + x = -2.764054992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -2.764054992 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -2.764054992 + -0.8 x = -2.764054992 + -0.8 Combine like terms: -2.764054992 + -0.8 = -3.564054992 x = -3.564054992 Simplifying x = -3.564054992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.964054992, -3.564054992}

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