Answer :

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

Opening the brackets we get,

= x + 7 + 4x - 20


= x + 4x + 7 - 20


= 5x - 13


Put x = 2


= 5(2) - 13


= 10 - 13


= -3


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

Opening the brackets we get,

= 3x + 6 + 5x - 7


= 3x + 5x + 6 - 7


= 8x - 1


Put x = 2


= 8(2) - 1


= 16 - 1


= 15


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

Opening the brackets we get,

= 6x + 5x - 10


= 11x - 10


Put x = 2


= 11(2) - 10


= 22 - 10


= 12


(iv) 4(2x - 1) + 3x + 11

Opening the brackets we get,

= 8x - 4 + 3x + 11


= 8x + 3x -4 + 11


= 11x + 7


Put x = 2


=11(2) + 7


= 22 + 7


= 29

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