Factor out common factors: Factor out the greatest common factor from the first two terms and the last two terms separately.For the first two terms, 3y3 and −15y2, the greatest common factor is 3y2.For the last two terms, −4y and +20, the greatest common factor is −4.So we have:3y3−15y2=3y2(y−5)−4y+20=−4(y−5)
Rewrite using factored terms: Now, we rewrite the original polynomial using the factored terms from Step 1.The polynomial becomes:3y2(y−5)−4(y−5)
Factor out common binomial: Factor out the common binomial factor (y−5) from both terms.We can see that (y−5) is a common factor in both terms, so we factor it out:(3y2−4)(y−5)
Check for further factoring: Check the factored form for any possible further factoring.The first term, 3y2−4, is a difference of squares and can be factored further.The second term, y−5, cannot be factored further.So we factor 3y2−4 as (3y−2)(3y+2).However, this is incorrect because 3y2−4 is not a difference of squares since 3 is not a perfect square.