27.5.SUBSTITUTE 3 FOR XIN THE FUNCTION F(X) = WALLS
29.27.5.Substitute 3 for xin the function f(x) = walls: 2(12 ×8) + 2(16 ×8) = 448. Since 13x
2
+ 2–x
+3
8
to get f(3) = 3(3)
2
+ 2–3
+3
8
=gallon of paint provides coverage of an area3(9) +
2
1
3
+
3
8
= 27 +
1
8
+
3
8
= 27 +
4
8
= 27.5.150 square feet, simply divide 448 by 150,