(5x+21)(7x-3)=0

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Solution for (5x+21)(7x-3)=0 equation:


Simplifying
(5x + 21)(7x + -3) = 0

Reorder the terms:
(21 + 5x)(7x + -3) = 0

Reorder the terms:
(21 + 5x)(-3 + 7x) = 0

Multiply (21 + 5x) * (-3 + 7x)
(21(-3 + 7x) + 5x * (-3 + 7x)) = 0
((-3 * 21 + 7x * 21) + 5x * (-3 + 7x)) = 0
((-63 + 147x) + 5x * (-3 + 7x)) = 0
(-63 + 147x + (-3 * 5x + 7x * 5x)) = 0
(-63 + 147x + (-15x + 35x2)) = 0

Combine like terms: 147x + -15x = 132x
(-63 + 132x + 35x2) = 0

Solving
-63 + 132x + 35x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-21 + -5x)(3 + -7x) = 0

Subproblem 1

Set the factor '(-21 + -5x)' equal to zero and attempt to solve: Simplifying -21 + -5x = 0 Solving -21 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -5x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -5x = 0 + 21 -5x = 0 + 21 Combine like terms: 0 + 21 = 21 -5x = 21 Divide each side by '-5'. x = -4.2 Simplifying x = -4.2

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 = {-4.2, 0.4285714286}

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