Answer:
this function does not look right . . .as the parenthesis are being multiplied twice . . .but as it is written it would be 623
Explanation:
-f(x) = 4(9x+3)2 +1 find f(-9)
multiple (9x + 3) by 8 (which is the 4 and the 2 multiplied together)
8(9x + 3) + 1
72x + 24 +1 (distributing the 8)
72x +25 (adding like terms)
substitute -9 in for x
72(-9) +25 72(-9) = -648 +25
combine like terms -f(-9) = -623
but since it is a negative function you would divide both sides
solution: f (-9) = 623