(5x+1)(x-2)=3

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Solution for (5x+1)(x-2)=3 equation:


Simplifying
(5x + 1)(x + -2) = 3

Reorder the terms:
(1 + 5x)(x + -2) = 3

Reorder the terms:
(1 + 5x)(-2 + x) = 3

Multiply (1 + 5x) * (-2 + x)
(1(-2 + x) + 5x * (-2 + x)) = 3
((-2 * 1 + x * 1) + 5x * (-2 + x)) = 3
((-2 + 1x) + 5x * (-2 + x)) = 3
(-2 + 1x + (-2 * 5x + x * 5x)) = 3
(-2 + 1x + (-10x + 5x2)) = 3

Combine like terms: 1x + -10x = -9x
(-2 + -9x + 5x2) = 3

Solving
-2 + -9x + 5x2 = 3

Solving for variable 'x'.

Reorder the terms:
-2 + -3 + -9x + 5x2 = 3 + -3

Combine like terms: -2 + -3 = -5
-5 + -9x + 5x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-5 + -9x + 5x2 = 0

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

Divide each side by '5'.
-1 + -1.8x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.8x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.8x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.8x + x2 = 0 + 1
-1.8x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.8x + x2 = 1

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 1 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 1 + 0.81

Combine like terms: 1 + 0.81 = 1.81
0.81 + -1.8x + x2 = 1.81

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 1.81

Calculate the square root of the right side: 1.345362405

Break this problem into two subproblems by setting 
(x + -0.9) equal to 1.345362405 and -1.345362405.

Subproblem 1

x + -0.9 = 1.345362405 Simplifying x + -0.9 = 1.345362405 Reorder the terms: -0.9 + x = 1.345362405 Solving -0.9 + x = 1.345362405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 1.345362405 + 0.9 x = 1.345362405 + 0.9 Combine like terms: 1.345362405 + 0.9 = 2.245362405 x = 2.245362405 Simplifying x = 2.245362405

Subproblem 2

x + -0.9 = -1.345362405 Simplifying x + -0.9 = -1.345362405 Reorder the terms: -0.9 + x = -1.345362405 Solving -0.9 + x = -1.345362405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -1.345362405 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -1.345362405 + 0.9 x = -1.345362405 + 0.9 Combine like terms: -1.345362405 + 0.9 = -0.445362405 x = -0.445362405 Simplifying x = -0.445362405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.245362405, -0.445362405}

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