Answer:
81f^2 + 180f + 100
Step-by-step explanation:
(9f +10)(9f+10)= 81f^2+ 90f+ 90f+100 = 81f^2 + 180f +100
81f^2+180f+100
(9f+10)^2
you can group it so it's:
(9f+10)(9f+10)
and then multiply that out (FOIL)
9f*9f = 81f^2
9f*10=90f 10*9f=90f 90f+90f=180f
10*10=100
