Question 250391
{{{220y+60y^2-225}}}
The factor of 5 is fairly obvious.
= {{{5*(44y+12y^2-45)}}}
Put it in descending order
= {{{5*(12y^2 + 44y - 45)}}}
Now it gets harder. Since the -45 is negative, the 2 signs are different.
12 can be 1*12, 2*6 or 3*4
45 can be 1*45, 3*15 or 5*9
It's a trial and error thing to find a combination that gives +44y
(3y + ??)*(4y + ??)
(3y + 5)*(4y - 9)  no good
(3y + 3)*(4y - 15) no good
(3y + 1)*(4y - 45) no good
(2y + 5)*(6y - 9) no good
(2y + 9)*(6y - 5) works
--> 5(2y+9)*(6y-5)
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Do you know the quadratic equation?  That's a better way to do these.