(2x+1)(x-10)=90

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Solution for (2x+1)(x-10)=90 equation:


Simplifying
(2x + 1)(x + -10) = 90

Reorder the terms:
(1 + 2x)(x + -10) = 90

Reorder the terms:
(1 + 2x)(-10 + x) = 90

Multiply (1 + 2x) * (-10 + x)
(1(-10 + x) + 2x * (-10 + x)) = 90
((-10 * 1 + x * 1) + 2x * (-10 + x)) = 90
((-10 + 1x) + 2x * (-10 + x)) = 90
(-10 + 1x + (-10 * 2x + x * 2x)) = 90
(-10 + 1x + (-20x + 2x2)) = 90

Combine like terms: 1x + -20x = -19x
(-10 + -19x + 2x2) = 90

Solving
-10 + -19x + 2x2 = 90

Solving for variable 'x'.

Reorder the terms:
-10 + -90 + -19x + 2x2 = 90 + -90

Combine like terms: -10 + -90 = -100
-100 + -19x + 2x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-100 + -19x + 2x2 = 0

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

Divide each side by '2'.
-50 + -9.5x + x2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + -9.5x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + -9.5x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + -9.5x + x2 = 0 + 50
-9.5x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
-9.5x + x2 = 50

The x term is -9.5x.  Take half its coefficient (-4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
-9.5x + 22.5625 + x2 = 50 + 22.5625

Reorder the terms:
22.5625 + -9.5x + x2 = 50 + 22.5625

Combine like terms: 50 + 22.5625 = 72.5625
22.5625 + -9.5x + x2 = 72.5625

Factor a perfect square on the left side:
(x + -4.75)(x + -4.75) = 72.5625

Calculate the square root of the right side: 8.518362519

Break this problem into two subproblems by setting 
(x + -4.75) equal to 8.518362519 and -8.518362519.

Subproblem 1

x + -4.75 = 8.518362519 Simplifying x + -4.75 = 8.518362519 Reorder the terms: -4.75 + x = 8.518362519 Solving -4.75 + x = 8.518362519 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = 8.518362519 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = 8.518362519 + 4.75 x = 8.518362519 + 4.75 Combine like terms: 8.518362519 + 4.75 = 13.268362519 x = 13.268362519 Simplifying x = 13.268362519

Subproblem 2

x + -4.75 = -8.518362519 Simplifying x + -4.75 = -8.518362519 Reorder the terms: -4.75 + x = -8.518362519 Solving -4.75 + x = -8.518362519 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = -8.518362519 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = -8.518362519 + 4.75 x = -8.518362519 + 4.75 Combine like terms: -8.518362519 + 4.75 = -3.768362519 x = -3.768362519 Simplifying x = -3.768362519

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.268362519, -3.768362519}

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