Question

Evaluate the expression, using the given value of the variable.  2 – 8x + 3x when x = 5

  A. –53   B. –23   C. –15   D. 57

Answer 1

2 - 8x + 3x
x = 5
2 - 8(5) + 3(5) =
2 - 40 + 15 =
- 40 + 17 = - 23. (Correct answer B.)

Answer 2

`2- 8x + 3x =2-5x \\ \\x=5 \\ \\2-5x = 2-5\cdot 5=2-25=-23\\ \\Answer : \ B. \ \ \ -23`