(10x+8)(x-1)=20

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Solution for (10x+8)(x-1)=20 equation:


Simplifying
(10x + 8)(x + -1) = 20

Reorder the terms:
(8 + 10x)(x + -1) = 20

Reorder the terms:
(8 + 10x)(-1 + x) = 20

Multiply (8 + 10x) * (-1 + x)
(8(-1 + x) + 10x * (-1 + x)) = 20
((-1 * 8 + x * 8) + 10x * (-1 + x)) = 20
((-8 + 8x) + 10x * (-1 + x)) = 20
(-8 + 8x + (-1 * 10x + x * 10x)) = 20
(-8 + 8x + (-10x + 10x2)) = 20

Combine like terms: 8x + -10x = -2x
(-8 + -2x + 10x2) = 20

Solving
-8 + -2x + 10x2 = 20

Solving for variable 'x'.

Reorder the terms:
-8 + -20 + -2x + 10x2 = 20 + -20

Combine like terms: -8 + -20 = -28
-28 + -2x + 10x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-28 + -2x + 10x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-14 + -1x + 5x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-14 + -1x + 5x2)' equal to zero and attempt to solve: Simplifying -14 + -1x + 5x2 = 0 Solving -14 + -1x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -2.8 + -0.2x + x2 = 0 Move the constant term to the right: Add '2.8' to each side of the equation. -2.8 + -0.2x + 2.8 + x2 = 0 + 2.8 Reorder the terms: -2.8 + 2.8 + -0.2x + x2 = 0 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + -0.2x + x2 = 0 + 2.8 -0.2x + x2 = 0 + 2.8 Combine like terms: 0 + 2.8 = 2.8 -0.2x + x2 = 2.8 The x term is -0.2x. Take half its coefficient (-0.1). Square it (0.01) and add it to both sides. Add '0.01' to each side of the equation. -0.2x + 0.01 + x2 = 2.8 + 0.01 Reorder the terms: 0.01 + -0.2x + x2 = 2.8 + 0.01 Combine like terms: 2.8 + 0.01 = 2.81 0.01 + -0.2x + x2 = 2.81 Factor a perfect square on the left side: (x + -0.1)(x + -0.1) = 2.81 Calculate the square root of the right side: 1.676305461 Break this problem into two subproblems by setting (x + -0.1) equal to 1.676305461 and -1.676305461.

Subproblem 1

x + -0.1 = 1.676305461 Simplifying x + -0.1 = 1.676305461 Reorder the terms: -0.1 + x = 1.676305461 Solving -0.1 + x = 1.676305461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 1.676305461 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 1.676305461 + 0.1 x = 1.676305461 + 0.1 Combine like terms: 1.676305461 + 0.1 = 1.776305461 x = 1.776305461 Simplifying x = 1.776305461

Subproblem 2

x + -0.1 = -1.676305461 Simplifying x + -0.1 = -1.676305461 Reorder the terms: -0.1 + x = -1.676305461 Solving -0.1 + x = -1.676305461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -1.676305461 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -1.676305461 + 0.1 x = -1.676305461 + 0.1 Combine like terms: -1.676305461 + 0.1 = -1.576305461 x = -1.576305461 Simplifying x = -1.576305461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.776305461, -1.576305461}

Solution

x = {1.776305461, -1.576305461}

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