Question

400 written as a product of its prime factors is 2×2×2×2×5×5.write 800 as a product of its prime factors

Answer 1

you would just multiply the prime factor of 400 times 2 so it would be 2x2x2x2x2x5x5.

Answer 2

Since 400 times 2=800
we add another 2 to the prime factors
400=2*2*2*2*5*5
800=2*400
800=2*2*2*2*2*5*5