5x^2+4x-35=0

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Solution for 5x^2+4x-35=0 equation:


Simplifying
5x2 + 4x + -35 = 0

Reorder the terms:
-35 + 4x + 5x2 = 0

Solving
-35 + 4x + 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 + 0.8x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 0.8x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 0.8x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 0.8x + x2 = 0 + 7
0.8x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
0.8x + x2 = 7

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 7 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 7 + 0.16

Combine like terms: 7 + 0.16 = 7.16
0.16 + 0.8x + x2 = 7.16

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 7.16

Calculate the square root of the right side: 2.675817632

Break this problem into two subproblems by setting 
(x + 0.4) equal to 2.675817632 and -2.675817632.

Subproblem 1

x + 0.4 = 2.675817632 Simplifying x + 0.4 = 2.675817632 Reorder the terms: 0.4 + x = 2.675817632 Solving 0.4 + x = 2.675817632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 2.675817632 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 2.675817632 + -0.4 x = 2.675817632 + -0.4 Combine like terms: 2.675817632 + -0.4 = 2.275817632 x = 2.275817632 Simplifying x = 2.275817632

Subproblem 2

x + 0.4 = -2.675817632 Simplifying x + 0.4 = -2.675817632 Reorder the terms: 0.4 + x = -2.675817632 Solving 0.4 + x = -2.675817632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -2.675817632 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -2.675817632 + -0.4 x = -2.675817632 + -0.4 Combine like terms: -2.675817632 + -0.4 = -3.075817632 x = -3.075817632 Simplifying x = -3.075817632

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.275817632, -3.075817632}

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