(5a-4)(4a+7)=

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Solution for (5a-4)(4a+7)= equation:


Simplifying
(5a + -4)(4a + 7) = 0

Reorder the terms:
(-4 + 5a)(4a + 7) = 0

Reorder the terms:
(-4 + 5a)(7 + 4a) = 0

Multiply (-4 + 5a) * (7 + 4a)
(-4(7 + 4a) + 5a * (7 + 4a)) = 0
((7 * -4 + 4a * -4) + 5a * (7 + 4a)) = 0
((-28 + -16a) + 5a * (7 + 4a)) = 0
(-28 + -16a + (7 * 5a + 4a * 5a)) = 0
(-28 + -16a + (35a + 20a2)) = 0

Combine like terms: -16a + 35a = 19a
(-28 + 19a + 20a2) = 0

Solving
-28 + 19a + 20a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(-7 + -4a)(4 + -5a) = 0

Subproblem 1

Set the factor '(-7 + -4a)' equal to zero and attempt to solve: Simplifying -7 + -4a = 0 Solving -7 + -4a = 0 Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -4a = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -4a = 0 + 7 -4a = 0 + 7 Combine like terms: 0 + 7 = 7 -4a = 7 Divide each side by '-4'. a = -1.75 Simplifying a = -1.75

Subproblem 2

Set the factor '(4 + -5a)' equal to zero and attempt to solve: Simplifying 4 + -5a = 0 Solving 4 + -5a = 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 + -5a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5a = 0 + -4 -5a = 0 + -4 Combine like terms: 0 + -4 = -4 -5a = -4 Divide each side by '-5'. a = 0.8 Simplifying a = 0.8

Solution

a = {-1.75, 0.8}

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