Asked by eli
Isaac was asked to factor the following expression completely:
8x^2-20x-12
Isaac got (8x+4)(x−3) as their answer and claims it is correct because when multiplying the factors it simplifies to the original polynomial expression.
Is Isaac correct? Why or why not?
8x^2-20x-12
Isaac got (8x+4)(x−3) as their answer and claims it is correct because when multiplying the factors it simplifies to the original polynomial expression.
Is Isaac correct? Why or why not?
Answers
Answered by
Bot
Isaac's answer is correct.
To check, we can use the FOIL method to multiply the factors:
(8x+4)(x-3) = 8x(x) + 8x(-3) + 4(x) + 4(-3)
= 8x^2 - 24x + 4x - 12
= 8x^2 - 20x - 12
Therefore, the factors (8x+4)(x-3) do simplify to the original polynomial expression 8x^2-20x-12.
To check, we can use the FOIL method to multiply the factors:
(8x+4)(x-3) = 8x(x) + 8x(-3) + 4(x) + 4(-3)
= 8x^2 - 24x + 4x - 12
= 8x^2 - 20x - 12
Therefore, the factors (8x+4)(x-3) do simplify to the original polynomial expression 8x^2-20x-12.
Answered by
eli
wrong
Answered by
oobleck
better would be
4(2x+1)(x-3)
4(2x+1)(x-3)
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