5x^2+22x-7=0

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Solution for 5x^2+22x-7=0 equation:


Simplifying
5x2 + 22x + -7 = 0

Reorder the terms:
-7 + 22x + 5x2 = 0

Solving
-7 + 22x + 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'.
-1.4 + 4.4x + x2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + 4.4x + 1.4 + x2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + 4.4x + x2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + 4.4x + x2 = 0 + 1.4
4.4x + x2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
4.4x + x2 = 1.4

The x term is 4.4x.  Take half its coefficient (2.2).
Square it (4.84) and add it to both sides.

Add '4.84' to each side of the equation.
4.4x + 4.84 + x2 = 1.4 + 4.84

Reorder the terms:
4.84 + 4.4x + x2 = 1.4 + 4.84

Combine like terms: 1.4 + 4.84 = 6.24
4.84 + 4.4x + x2 = 6.24

Factor a perfect square on the left side:
(x + 2.2)(x + 2.2) = 6.24

Calculate the square root of the right side: 2.497999199

Break this problem into two subproblems by setting 
(x + 2.2) equal to 2.497999199 and -2.497999199.

Subproblem 1

x + 2.2 = 2.497999199 Simplifying x + 2.2 = 2.497999199 Reorder the terms: 2.2 + x = 2.497999199 Solving 2.2 + x = 2.497999199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.2' to each side of the equation. 2.2 + -2.2 + x = 2.497999199 + -2.2 Combine like terms: 2.2 + -2.2 = 0.0 0.0 + x = 2.497999199 + -2.2 x = 2.497999199 + -2.2 Combine like terms: 2.497999199 + -2.2 = 0.297999199 x = 0.297999199 Simplifying x = 0.297999199

Subproblem 2

x + 2.2 = -2.497999199 Simplifying x + 2.2 = -2.497999199 Reorder the terms: 2.2 + x = -2.497999199 Solving 2.2 + x = -2.497999199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.2' to each side of the equation. 2.2 + -2.2 + x = -2.497999199 + -2.2 Combine like terms: 2.2 + -2.2 = 0.0 0.0 + x = -2.497999199 + -2.2 x = -2.497999199 + -2.2 Combine like terms: -2.497999199 + -2.2 = -4.697999199 x = -4.697999199 Simplifying x = -4.697999199

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.297999199, -4.697999199}

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