5x^2=1-7x

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Solution for 5x^2=1-7x equation:


Simplifying
5x2 = 1 + -7x

Solving
5x2 = 1 + -7x

Solving for variable 'x'.

Reorder the terms:
-1 + 7x + 5x2 = 1 + -7x + -1 + 7x

Reorder the terms:
-1 + 7x + 5x2 = 1 + -1 + -7x + 7x

Combine like terms: 1 + -1 = 0
-1 + 7x + 5x2 = 0 + -7x + 7x
-1 + 7x + 5x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
-1 + 7x + 5x2 = 0

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

Divide each side by '5'.
-0.2 + 1.4x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 1.4x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 1.4x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 1.4x + x2 = 0 + 0.2
1.4x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
1.4x + x2 = 0.2

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 = 0.2 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = 0.2 + 0.49

Combine like terms: 0.2 + 0.49 = 0.69
0.49 + 1.4x + x2 = 0.69

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = 0.69

Calculate the square root of the right side: 0.830662386

Break this problem into two subproblems by setting 
(x + 0.7) equal to 0.830662386 and -0.830662386.

Subproblem 1

x + 0.7 = 0.830662386 Simplifying x + 0.7 = 0.830662386 Reorder the terms: 0.7 + x = 0.830662386 Solving 0.7 + x = 0.830662386 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 = 0.830662386 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 0.830662386 + -0.7 x = 0.830662386 + -0.7 Combine like terms: 0.830662386 + -0.7 = 0.130662386 x = 0.130662386 Simplifying x = 0.130662386

Subproblem 2

x + 0.7 = -0.830662386 Simplifying x + 0.7 = -0.830662386 Reorder the terms: 0.7 + x = -0.830662386 Solving 0.7 + x = -0.830662386 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 = -0.830662386 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -0.830662386 + -0.7 x = -0.830662386 + -0.7 Combine like terms: -0.830662386 + -0.7 = -1.530662386 x = -1.530662386 Simplifying x = -1.530662386

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.130662386, -1.530662386}

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