5x^2+4x=170

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Solution for 5x^2+4x=170 equation:


Simplifying
5x2 + 4x = 170

Reorder the terms:
4x + 5x2 = 170

Solving
4x + 5x2 = 170

Solving for variable 'x'.

Reorder the terms:
-170 + 4x + 5x2 = 170 + -170

Combine like terms: 170 + -170 = 0
-170 + 4x + 5x2 = 0

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

Divide each side by '5'.
-34 + 0.8x + x2 = 0

Move the constant term to the right:

Add '34' to each side of the equation.
-34 + 0.8x + 34 + x2 = 0 + 34

Reorder the terms:
-34 + 34 + 0.8x + x2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + 0.8x + x2 = 0 + 34
0.8x + x2 = 0 + 34

Combine like terms: 0 + 34 = 34
0.8x + x2 = 34

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 = 34 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 34 + 0.16

Combine like terms: 34 + 0.16 = 34.16
0.16 + 0.8x + x2 = 34.16

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 34.16

Calculate the square root of the right side: 5.844655678

Break this problem into two subproblems by setting 
(x + 0.4) equal to 5.844655678 and -5.844655678.

Subproblem 1

x + 0.4 = 5.844655678 Simplifying x + 0.4 = 5.844655678 Reorder the terms: 0.4 + x = 5.844655678 Solving 0.4 + x = 5.844655678 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 = 5.844655678 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 5.844655678 + -0.4 x = 5.844655678 + -0.4 Combine like terms: 5.844655678 + -0.4 = 5.444655678 x = 5.444655678 Simplifying x = 5.444655678

Subproblem 2

x + 0.4 = -5.844655678 Simplifying x + 0.4 = -5.844655678 Reorder the terms: 0.4 + x = -5.844655678 Solving 0.4 + x = -5.844655678 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 = -5.844655678 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -5.844655678 + -0.4 x = -5.844655678 + -0.4 Combine like terms: -5.844655678 + -0.4 = -6.244655678 x = -6.244655678 Simplifying x = -6.244655678

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.444655678, -6.244655678}

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