=(5x+7)(7x+3)

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


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

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

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

Multiply (7 + 5x) * (3 + 7x)
0 = (7(3 + 7x) + 5x * (3 + 7x))
0 = ((3 * 7 + 7x * 7) + 5x * (3 + 7x))
0 = ((21 + 49x) + 5x * (3 + 7x))
0 = (21 + 49x + (3 * 5x + 7x * 5x))
0 = (21 + 49x + (15x + 35x2))

Combine like terms: 49x + 15x = 64x
0 = (21 + 64x + 35x2)

Solving
0 = 21 + 64x + 35x2

Solving for variable 'x'.

Combine like terms: 0 + -21 = -21
-21 + -64x + -35x2 = 21 + 64x + 35x2 + -21 + -64x + -35x2

Reorder the terms:
-21 + -64x + -35x2 = 21 + -21 + 64x + -64x + 35x2 + -35x2

Combine like terms: 21 + -21 = 0
-21 + -64x + -35x2 = 0 + 64x + -64x + 35x2 + -35x2
-21 + -64x + -35x2 = 64x + -64x + 35x2 + -35x2

Combine like terms: 64x + -64x = 0
-21 + -64x + -35x2 = 0 + 35x2 + -35x2
-21 + -64x + -35x2 = 35x2 + -35x2

Combine like terms: 35x2 + -35x2 = 0
-21 + -64x + -35x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(21 + 64x + 35x2) = 0

Factor a trinomial.
-1((7 + 5x)(3 + 7x)) = 0

Ignore the factor -1.

Subproblem 1

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

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 = {-1.4, -0.4285714286}

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