Question

can someone explain these steps to me, specifically how they got the numbers in the 3rd line

Answer 1

thats good i thank

Answer 2

i like it

Answer 3

thats not what i asked

Answer 4

lol

Answer 5

ok

Answer 6

they replaced p with (1/2 q + 19)

(Not sure about the context behind that substitution)

They used FOIL to expand that

They subtracted 400 from each side

Then they multiplied both sides by 2 to eliminate that fraction on 1/2 q

Then they factored

Answer 7

i shouldve provided the context of the question, sorry:

Answer 8

ahh ok i see, i didnt realize they used FOIL

Answer 9

thank you that makes much more sense now