(3a-4)(2a+5)=

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Solution for (3a-4)(2a+5)= equation:


Simplifying
(3a + -4)(2a + 5) = 0

Reorder the terms:
(-4 + 3a)(2a + 5) = 0

Reorder the terms:
(-4 + 3a)(5 + 2a) = 0

Multiply (-4 + 3a) * (5 + 2a)
(-4(5 + 2a) + 3a * (5 + 2a)) = 0
((5 * -4 + 2a * -4) + 3a * (5 + 2a)) = 0
((-20 + -8a) + 3a * (5 + 2a)) = 0
(-20 + -8a + (5 * 3a + 2a * 3a)) = 0
(-20 + -8a + (15a + 6a2)) = 0

Combine like terms: -8a + 15a = 7a
(-20 + 7a + 6a2) = 0

Solving
-20 + 7a + 6a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(-5 + -2a)(4 + -3a) = 0

Subproblem 1

Set the factor '(-5 + -2a)' equal to zero and attempt to solve: Simplifying -5 + -2a = 0 Solving -5 + -2a = 0 Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2a = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2a = 0 + 5 -2a = 0 + 5 Combine like terms: 0 + 5 = 5 -2a = 5 Divide each side by '-2'. a = -2.5 Simplifying a = -2.5

Subproblem 2

Set the factor '(4 + -3a)' equal to zero and attempt to solve: Simplifying 4 + -3a = 0 Solving 4 + -3a = 0 Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -3a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3a = 0 + -4 -3a = 0 + -4 Combine like terms: 0 + -4 = -4 -3a = -4 Divide each side by '-3'. a = 1.333333333 Simplifying a = 1.333333333

Solution

a = {-2.5, 1.333333333}

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