Question

what steps would I take to explain these the difference in these 3 problems
a2 - 25

a2 + 8a + 16

a2 - 8a + 16

Answer 1

is that a^2 or 2a?

Answer 2

a^2-25
=(a)^2-(5)^2
(a+5)(a-5)

Answer 3

first one is not aperfect square .

and the remaining are perfect squares

Answer 4

a^2+2+4a+(4)^2
=(a+4)^2

Answer 5

a^2-2*4a+(4)^2
=(a-4)^2

Answer 6

third one (a-4)^2

Answer 7

it's a to the second power