Question

Evaluate each expression for a=7, b=4, and c=-3.

A) 26.3a - 5b
B) 2a - 7b - 8c
C) a^2 - b^2 + c^2
D) ab - 6b + 9c
A) 103.5, 45, 74, -105
B) 93.7, 68, 74, -87
C) 94.5, 64, 77, -98
D) 84.7, 75, 86, -96

Answer 1

To evaluate the expressions for a=7, b=4, and c=-3: A) 26.3a - 5b = 163.1, B) 2a - 7b - 8c = 10, C) a^2 - b^2 + c^2 = 42, D) ab - 6b + 9c = -23

Step-by-step explanation:

To evaluate the expressions for a=7, b=4, and c=-3:

A) 26.3a - 5b = 26.3x7 - 5x4 = 183.1 - 20 = 163.1

B) 2a - 7b - 8c = 2x7 - 7x4 - 8x(-3) = 14 - 28 + 24 = 10

C) a^2 - b^2 + c^2 = 7^2 - 4^2 + (-3)^2 = 49 - 16 + 9 = 42

D) ab - 6b + 9c = 7x4 - 6x4 + 9x(-3) = 28 - 24 - 27 = -23