Question

B. Evaluate the following algebraic expressions for the given value of x

1.2x—7 where x=4

Solution:

2.4x—8/3x+4 where x=—1

Solution:

3.x²—6x+5 where x=—3

Solution:

Answer 1

1. 2x-7

$\Rightarrow \text{ At } x=4 \Rightarrow 2(4)-7=8-7=1$

$2. 4x-\dfrac{8}{3}x+4$

 at x=-1,

 $4(-1)-\dfrac{8}{3}(-1)+4=\dfrac{8}{3}$

3.$x^2-6x+5$

  at x=-3, 

 $(-3)^2-6(-3)+5 =9+18+5=32$