Factor the gcf: 28a3b4 + 20a2b2 − 16ab3.

Step-by-step explanation:

28a3b4 + 20a2b2 − 16ab3.

To find GCF we look at a factor that divides 28, 20 and -16

All are divisible by 4. GCF of numbers is 4

for a^3, a^2 and a. GCF is always the variable with lowest exponent that is 'a'

for b^4, b^2 and b^3 the GCF is b^2

for whole expression the GCF is 4ab^2

Now we divide each term by GCF and put 4ab^2 outside

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225