superkillerjames
4

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

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