x(5x+2)=2x^2-5x+40

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Solution for x(5x+2)=2x^2-5x+40 equation: 


Simplifying
x(5x + 2) = 2x2 + -5x + 40

Reorder the terms:
x(2 + 5x) = 2x2 + -5x + 40
(2 * x + 5x * x) = 2x2 + -5x + 40
(2x + 5x2) = 2x2 + -5x + 40

Reorder the terms:
2x + 5x2 = 40 + -5x + 2x2

Solving
2x + 5x2 = 40 + -5x + 2x2

Solving for variable 'x'.

Reorder the terms:
-40 + 2x + 5x + 5x2 + -2x2 = 40 + -5x + 2x2 + -40 + 5x + -2x2

Combine like terms: 2x + 5x = 7x
-40 + 7x + 5x2 + -2x2 = 40 + -5x + 2x2 + -40 + 5x + -2x2

Combine like terms: 5x2 + -2x2 = 3x2
-40 + 7x + 3x2 = 40 + -5x + 2x2 + -40 + 5x + -2x2

Reorder the terms:
-40 + 7x + 3x2 = 40 + -40 + -5x + 5x + 2x2 + -2x2

Combine like terms: 40 + -40 = 0
-40 + 7x + 3x2 = 0 + -5x + 5x + 2x2 + -2x2
-40 + 7x + 3x2 = -5x + 5x + 2x2 + -2x2

Combine like terms: -5x + 5x = 0
-40 + 7x + 3x2 = 0 + 2x2 + -2x2
-40 + 7x + 3x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-40 + 7x + 3x2 = 0

Factor a trinomial.
(-5 + -1x)(8 + -3x) = 0


Subproblem 1
Set the factor '(-5 + -1x)' equal to zero and attempt to solve:

Simplifying
-5 + -1x = 0

Solving
-5 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '5' to each side of the equation.
-5 + 5 + -1x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1x = 0 + 5
-1x = 0 + 5

Combine like terms: 0 + 5 = 5
-1x = 5

Divide each side by '-1'.
x = -5

Simplifying
x = -5

Subproblem 2
Set the factor '(8 + -3x)' equal to zero and attempt to solve:

Simplifying
8 + -3x = 0

Solving
8 + -3x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -3x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -3x = 0 + -8
-3x = 0 + -8

Combine like terms: 0 + -8 = -8
-3x = -8

Divide each side by '-3'.
x = 2.666666667

Simplifying
x = 2.666666667
Solution
x = {-5, 2.666666667}

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