Find the GCF of each expression. Then factor the expression. 25b^2 - 20b

Hello!The prime factors of these two numbres are : [tex]25b^2 = 5^2\times b^2\\
20b = 5\times 2^2 \times b[/tex]The GCF can be calculated by multiplying common primes factors : [tex]5\times b = 5b[/tex]So the GCF is 5b and the expression can be factored this way : [tex]25b^2 - 20b = 5b\times 5b - 4\times 5b = 5b\left(5b-4\right)[/tex]