Question

1. Evaluate the following.
a) (2x + y) - 4 for x = 6 and y=4.
C) - 3abc - 3 for a = 1, b = 2 and c = 3
b) 8x2 + 5xy - y3 for x = 3 and y = 2
d) 9x2 + 3x + 2 + 4 for x = 5​

Answer 1

Answer:

a. (2*6+4)-4=(12+4)-4=(16)-4= -64

Answer 2

Step-by-step explanation:

(a) x=6 and y=4

therefore

(2×6+4)-4

=(12+4)-4

=16-4

=12

(c) a=1,b=2 and c=3

therfore

=-3×1×2×3-3

=-18-3

=-21

(b) a=3,y=2

therefore

=8×2+5×3×2-2×3

=16+30-6

=46-6

=40

(d) x=5

therefore

=9×2+3×5+2+4

=18+15+2+4

=39