Question

Find the value of the following expression, when x = -1

(a) 7x + 2(x + 2)
(b) 3(x- 3) -3x +1

Answer 1

Answer:

a) 7×(-1)+2(-1+2)

=-7+(-2+4)

=-7+2

=-5

b)3×(-1-3)-3×(-1)+1

=3×(-4)+3+1

=-12+4

=-8

Answer 2

Answer:

(a) 7(-1)+2(-1+2)

= -7+2

= -5