4(-5x-10)(-5x+4) / 4
Product of AC= -40
Sum of B= -6
Please help i cant divide -5x by 4, even if i split 4 to 2x2
factor out -4, you get
you're using the ac method, so i will as well. here ac = -40 and b = 6, so think of two number that when you multiply them you get -40, but you add them and get 6. 10 and -4 works. so split the middle term into those two, you have:
now factor what's inside the brackets using "factor by grouping"