Question

subtract y^2 = 4 from 3y^2 + 8
y

Answer 1

3y^2+8-(y^2-4)
=>2y^2+12

Answer 2

3(4)+8

Answer 3

this equals 20

Answer 4

when u subtract then u hav,
3y^2+8y-(y^2-4)
=>2y^2+8y+4

Answer 5

he gives you what y^2 equals. so you just plug that into 3(y^2)+8

Answer 6

nope, the question is , subtract y^2=4 from 3y^2+8y

if it was like the way u understood then there no use of the word 'SUBTRACT'
get it?