(-5b-7)(4b+3)-(-10b+7)(-5b-7)=0

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Solution for (-5b-7)(4b+3)-(-10b+7)(-5b-7)=0 equation:


Simplifying
(-5b + -7)(4b + 3) + -1(-10b + 7)(-5b + -7) = 0

Reorder the terms:
(-7 + -5b)(4b + 3) + -1(-10b + 7)(-5b + -7) = 0

Reorder the terms:
(-7 + -5b)(3 + 4b) + -1(-10b + 7)(-5b + -7) = 0

Multiply (-7 + -5b) * (3 + 4b)
(-7(3 + 4b) + -5b * (3 + 4b)) + -1(-10b + 7)(-5b + -7) = 0
((3 * -7 + 4b * -7) + -5b * (3 + 4b)) + -1(-10b + 7)(-5b + -7) = 0
((-21 + -28b) + -5b * (3 + 4b)) + -1(-10b + 7)(-5b + -7) = 0
(-21 + -28b + (3 * -5b + 4b * -5b)) + -1(-10b + 7)(-5b + -7) = 0
(-21 + -28b + (-15b + -20b2)) + -1(-10b + 7)(-5b + -7) = 0

Combine like terms: -28b + -15b = -43b
(-21 + -43b + -20b2) + -1(-10b + 7)(-5b + -7) = 0

Reorder the terms:
-21 + -43b + -20b2 + -1(7 + -10b)(-5b + -7) = 0

Reorder the terms:
-21 + -43b + -20b2 + -1(7 + -10b)(-7 + -5b) = 0

Multiply (7 + -10b) * (-7 + -5b)
-21 + -43b + -20b2 + -1(7(-7 + -5b) + -10b * (-7 + -5b)) = 0
-21 + -43b + -20b2 + -1((-7 * 7 + -5b * 7) + -10b * (-7 + -5b)) = 0
-21 + -43b + -20b2 + -1((-49 + -35b) + -10b * (-7 + -5b)) = 0
-21 + -43b + -20b2 + -1(-49 + -35b + (-7 * -10b + -5b * -10b)) = 0
-21 + -43b + -20b2 + -1(-49 + -35b + (70b + 50b2)) = 0

Combine like terms: -35b + 70b = 35b
-21 + -43b + -20b2 + -1(-49 + 35b + 50b2) = 0
-21 + -43b + -20b2 + (-49 * -1 + 35b * -1 + 50b2 * -1) = 0
-21 + -43b + -20b2 + (49 + -35b + -50b2) = 0

Reorder the terms:
-21 + 49 + -43b + -35b + -20b2 + -50b2 = 0

Combine like terms: -21 + 49 = 28
28 + -43b + -35b + -20b2 + -50b2 = 0

Combine like terms: -43b + -35b = -78b
28 + -78b + -20b2 + -50b2 = 0

Combine like terms: -20b2 + -50b2 = -70b2
28 + -78b + -70b2 = 0

Solving
28 + -78b + -70b2 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '2'.
2(14 + -39b + -35b2) = 0

Factor a trinomial.
2((2 + -7b)(7 + 5b)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(2 + -7b)' equal to zero and attempt to solve: Simplifying 2 + -7b = 0 Solving 2 + -7b = 0 Move all terms containing b to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -7b = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -7b = 0 + -2 -7b = 0 + -2 Combine like terms: 0 + -2 = -2 -7b = -2 Divide each side by '-7'. b = 0.2857142857 Simplifying b = 0.2857142857

Subproblem 2

Set the factor '(7 + 5b)' equal to zero and attempt to solve: Simplifying 7 + 5b = 0 Solving 7 + 5b = 0 Move all terms containing b to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5b = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 5b = 0 + -7 5b = 0 + -7 Combine like terms: 0 + -7 = -7 5b = -7 Divide each side by '5'. b = -1.4 Simplifying b = -1.4

Solution

b = {0.2857142857, -1.4}

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