Q.6 Simplify the expressions and find the value if x is equal to 2.
(i) x + 7 +4(x – 5)
(ii) 3(x + 2) + 5x – 7
(iii) 6x + 5(x – 2)
(iv) 4(2x – 1) + 3x + 11

(i) x + 7 + 4(x – 5)
= x + 7 + 4x – 20
= 5x – 13
Putting x = 2, we get
= 5 × 2 – 13
= 10 – 13 = -3
(ii) 3(x + 2) + 5x – 7
= 3x + 6 + 5x -7
= 8x – 1
Putting x = 2, we get
= 8 × 2 – 1
= 16 – 1 = 15
(iii) 6x + 5(x – 2)
= 6x + 5x – 10
= 11 × – 10
Putting x = 2, we get
= 11 × 2 – 10
= 22 – 10 = 12
(iv) 4(2x – 1) + 3x + 11
= 8x – 4 + 3x + 11
= 11x + 7
Putting x = 2, we get
= 11 × 2 + 7
= 22+ 7 = 29