5=2x^2+8x-7

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Solution for 5=2x^2+8x-7 equation:


Simplifying
5 = 2x2 + 8x + -7

Reorder the terms:
5 = -7 + 8x + 2x2

Solving
5 = -7 + 8x + 2x2

Solving for variable 'x'.

Combine like terms: 5 + 7 = 12
12 + -8x + -2x2 = -7 + 8x + 2x2 + 7 + -8x + -2x2

Reorder the terms:
12 + -8x + -2x2 = -7 + 7 + 8x + -8x + 2x2 + -2x2

Combine like terms: -7 + 7 = 0
12 + -8x + -2x2 = 0 + 8x + -8x + 2x2 + -2x2
12 + -8x + -2x2 = 8x + -8x + 2x2 + -2x2

Combine like terms: 8x + -8x = 0
12 + -8x + -2x2 = 0 + 2x2 + -2x2
12 + -8x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
12 + -8x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(6 + -4x + -1x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(6 + -4x + -1x2)' equal to zero and attempt to solve: Simplifying 6 + -4x + -1x2 = 0 Solving 6 + -4x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -6 + 4x + x2 = 0 Move the constant term to the right: Add '6' to each side of the equation. -6 + 4x + 6 + x2 = 0 + 6 Reorder the terms: -6 + 6 + 4x + x2 = 0 + 6 Combine like terms: -6 + 6 = 0 0 + 4x + x2 = 0 + 6 4x + x2 = 0 + 6 Combine like terms: 0 + 6 = 6 4x + x2 = 6 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = 6 + 4 Reorder the terms: 4 + 4x + x2 = 6 + 4 Combine like terms: 6 + 4 = 10 4 + 4x + x2 = 10 Factor a perfect square on the left side: (x + 2)(x + 2) = 10 Calculate the square root of the right side: 3.16227766 Break this problem into two subproblems by setting (x + 2) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + 2 = 3.16227766 Simplifying x + 2 = 3.16227766 Reorder the terms: 2 + x = 3.16227766 Solving 2 + x = 3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 3.16227766 + -2 Combine like terms: 2 + -2 = 0 0 + x = 3.16227766 + -2 x = 3.16227766 + -2 Combine like terms: 3.16227766 + -2 = 1.16227766 x = 1.16227766 Simplifying x = 1.16227766

Subproblem 2

x + 2 = -3.16227766 Simplifying x + 2 = -3.16227766 Reorder the terms: 2 + x = -3.16227766 Solving 2 + x = -3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -3.16227766 + -2 Combine like terms: 2 + -2 = 0 0 + x = -3.16227766 + -2 x = -3.16227766 + -2 Combine like terms: -3.16227766 + -2 = -5.16227766 x = -5.16227766 Simplifying x = -5.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.16227766, -5.16227766}

Solution

x = {1.16227766, -5.16227766}

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