5x^2+14x=7

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Solution for 5x^2+14x=7 equation:


Simplifying
5x2 + 14x = 7

Reorder the terms:
14x + 5x2 = 7

Solving
14x + 5x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 14x + 5x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 14x + 5x2 = 0

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

Divide each side by '5'.
-1.4 + 2.8x + x2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + 2.8x + 1.4 + x2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + 2.8x + x2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + 2.8x + x2 = 0 + 1.4
2.8x + x2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
2.8x + x2 = 1.4

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = 1.4 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = 1.4 + 1.96

Combine like terms: 1.4 + 1.96 = 3.36
1.96 + 2.8x + x2 = 3.36

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 3.36

Calculate the square root of the right side: 1.833030278

Break this problem into two subproblems by setting 
(x + 1.4) equal to 1.833030278 and -1.833030278.

Subproblem 1

x + 1.4 = 1.833030278 Simplifying x + 1.4 = 1.833030278 Reorder the terms: 1.4 + x = 1.833030278 Solving 1.4 + x = 1.833030278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 1.833030278 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 1.833030278 + -1.4 x = 1.833030278 + -1.4 Combine like terms: 1.833030278 + -1.4 = 0.433030278 x = 0.433030278 Simplifying x = 0.433030278

Subproblem 2

x + 1.4 = -1.833030278 Simplifying x + 1.4 = -1.833030278 Reorder the terms: 1.4 + x = -1.833030278 Solving 1.4 + x = -1.833030278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -1.833030278 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -1.833030278 + -1.4 x = -1.833030278 + -1.4 Combine like terms: -1.833030278 + -1.4 = -3.233030278 x = -3.233030278 Simplifying x = -3.233030278

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.433030278, -3.233030278}

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