(4+x)(5x+7)=0

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Solution for (4+x)(5x+7)=0 equation: 


Simplifying
(4 + x)(5x + 7) = 0

Reorder the terms:
(4 + x)(7 + 5x) = 0

Multiply (4 + x) * (7 + 5x)
(4(7 + 5x) + x(7 + 5x)) = 0
((7 * 4 + 5x * 4) + x(7 + 5x)) = 0
((28 + 20x) + x(7 + 5x)) = 0
(28 + 20x + (7 * x + 5x * x)) = 0
(28 + 20x + (7x + 5x2)) = 0

Combine like terms: 20x + 7x = 27x
(28 + 27x + 5x2) = 0

Solving
28 + 27x + 5x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(4 + x)(7 + 5x) = 0


Subproblem 1
Set the factor '(4 + x)' equal to zero and attempt to solve:

Simplifying
4 + x = 0

Solving
4 + x = 0

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

Add '-4' to each side of the equation.
4 + -4 + x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + x = 0 + -4
x = 0 + -4

Combine like terms: 0 + -4 = -4
x = -4

Simplifying
x = -4

Subproblem 2
Set the factor '(7 + 5x)' equal to zero and attempt to solve:

Simplifying
7 + 5x = 0

Solving
7 + 5x = 0

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

Add '-7' to each side of the equation.
7 + -7 + 5x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 5x = 0 + -7
5x = 0 + -7

Combine like terms: 0 + -7 = -7
5x = -7

Divide each side by '5'.
x = -1.4

Simplifying
x = -1.4
Solution
x = {-4, -1.4}

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