Question

Simplify the following expressions and then find the numerical values for x = -2.

(i) 3(2x – 4) + x2 + 5

(ii) -2(-3x + 5) – 2(x + 4)

Q14. If P = 2x2 – 5x + 2, Q = 5x2 + 6x – 3 and R = 3x2 – x – 1. Find the value of 2P – Q + 3R.​

Answer 1

Step-by-step explanation:

i. 3 ( 2 (-2) - 4) + (-2)² + 5

3 ( - 8 ) + 4

-24 + 4

-20

ii. -2 ( -3 (-2) + 5 ) - 2 ( -2 + 4 )

-2 ( 6 + 5 ) - 2 ( 2 )

-2 ( 11 ) - 4

-22 - 4

-26