Question

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 - 7 Simplify then ​

Answer 1

Answer:

(i) -3

(ii) 15

(iii) 12

(iv) 22

Step-by-step explanation:

It is given that x = 2

Put x = 2 in each equation

(i) x + 7 + 4 (x - 5) = x + 7 + 4x - 20

  = 5x - 13 = (5 × 2) - 13 = 10 - 13

  = -3

(ii) 3 (x + 2) + 5x - 7 = 3x + 6 + 5x - 7

   = 8x - 1 = (8 × 2) - 1 = 16 - 1

   = 15

(iii) 6x + 5 (x - 2) = 6x + 5x - 10

    = 11x - 10 = (11 × 2) - 10 = 22 - 10

    = 12

(iv)  4(2x - 1) + 3x + 11 - 7 = 8x - 4 + 3x + 4

     = 11x + 0 = 11 × 2

     = 22