Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression?
(4x2 + 3)(x2 – 5)
(4x2 – 3)(x2 – 5)
(4x2 – 5)(x2 + 3)
(4x2 + 5)(x2 – 3)

Factoring the polynomial by grouping means separation of the polynomial in two addends, each of them consists of two addends:

In first brackets the common factor is in second brackets the common factor is

Then

correct choice is B

answer: 91

step-by-step explanation: