5x^2+7x=7

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Solution for 5x^2+7x=7 equation:


Simplifying
5x2 + 7x = 7

Reorder the terms:
7x + 5x2 = 7

Solving
7x + 5x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 7x + 5x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 7x + 5x2 = 0

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

Divide each side by '5'.
-1.4 + 1.4x + x2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + 1.4x + 1.4 + x2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + 1.4x + x2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + 1.4x + x2 = 0 + 1.4
1.4x + x2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
1.4x + x2 = 1.4

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = 1.4 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = 1.4 + 0.49

Combine like terms: 1.4 + 0.49 = 1.89
0.49 + 1.4x + x2 = 1.89

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = 1.89

Calculate the square root of the right side: 1.374772708

Break this problem into two subproblems by setting 
(x + 0.7) equal to 1.374772708 and -1.374772708.

Subproblem 1

x + 0.7 = 1.374772708 Simplifying x + 0.7 = 1.374772708 Reorder the terms: 0.7 + x = 1.374772708 Solving 0.7 + x = 1.374772708 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = 1.374772708 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 1.374772708 + -0.7 x = 1.374772708 + -0.7 Combine like terms: 1.374772708 + -0.7 = 0.674772708 x = 0.674772708 Simplifying x = 0.674772708

Subproblem 2

x + 0.7 = -1.374772708 Simplifying x + 0.7 = -1.374772708 Reorder the terms: 0.7 + x = -1.374772708 Solving 0.7 + x = -1.374772708 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = -1.374772708 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -1.374772708 + -0.7 x = -1.374772708 + -0.7 Combine like terms: -1.374772708 + -0.7 = -2.074772708 x = -2.074772708 Simplifying x = -2.074772708

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.674772708, -2.074772708}

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