Multiply your "a" value by your "c" value. In your equation, you use 4(-3) to get -12. Now, rewrite your middle term, 11rs using factors of -12. In your case, 12rs and -1rs.
Here's what the new expression looks like:
4r^2 +12rs + -1rs + -3s^2
Factor the first two terms separate from the last two terms to get:
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Verified answer
Have you ever factored by grouping?
Multiply your "a" value by your "c" value. In your equation, you use 4(-3) to get -12. Now, rewrite your middle term, 11rs using factors of -12. In your case, 12rs and -1rs.
Here's what the new expression looks like:
4r^2 +12rs + -1rs + -3s^2
Factor the first two terms separate from the last two terms to get:
4r(r + 3s) + -1s(r + 3s)
Factor out (r + 3s) from both products to get:
(r + 3s)(4r + -1s)
Hope this helps!! :)