Answer:
(4x^2-3)(x^2-5)
Step-by-step explanation:
We are going to group the first two and last two terms and find the GCF of each set.
4x^4-20x^2-3x^2+15
(4x^4-20x^2)(-3x^2+15)
4x^2(x^2-5)-3(x^2-5)
Then we group the GFCs together and the rest
(4x^2-3)(x^2-5)
