(3x+7)*(7x-3)=

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Solution for (3x+7)*(7x-3)= equation: 


Simplifying
(3x + 7)(7x + -3) = 0

Reorder the terms:
(7 + 3x)(7x + -3) = 0

Reorder the terms:
(7 + 3x)(-3 + 7x) = 0

Multiply (7 + 3x) * (-3 + 7x)
(7(-3 + 7x) + 3x * (-3 + 7x)) = 0
((-3 * 7 + 7x * 7) + 3x * (-3 + 7x)) = 0
((-21 + 49x) + 3x * (-3 + 7x)) = 0
(-21 + 49x + (-3 * 3x + 7x * 3x)) = 0
(-21 + 49x + (-9x + 21x2)) = 0

Combine like terms: 49x + -9x = 40x
(-21 + 40x + 21x2) = 0

Solving
-21 + 40x + 21x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -3x)(3 + -7x) = 0


Subproblem 1
Set the factor '(-7 + -3x)' equal to zero and attempt to solve:

Simplifying
-7 + -3x = 0

Solving
-7 + -3x = 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 + -3x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -3x = 0 + 7
-3x = 0 + 7

Combine like terms: 0 + 7 = 7
-3x = 7

Divide each side by '-3'.
x = -2.333333333

Simplifying
x = -2.333333333

Subproblem 2
Set the factor '(3 + -7x)' equal to zero and attempt to solve:

Simplifying
3 + -7x = 0

Solving
3 + -7x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -7x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -7x = 0 + -3
-7x = 0 + -3

Combine like terms: 0 + -3 = -3
-7x = -3

Divide each side by '-7'.
x = 0.4285714286

Simplifying
x = 0.4285714286
Solution
x = {-2.333333333, 0.4285714286}

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