Selina solutions

Selina solutions

Grade 6

Framing Algebraic Expressions (Including Evaluation) | Exercise 21

Question 11

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Question 11

Q11)If m = – 7, evaluate :

(i) 12m

(ii)2m^2

(iii)2m^3

Solution:

(i) 12m

= 12 x (-7)

= -84

(ii)2m^2

= 2 x m x m

= 2 x (-7) x (-7)

= 2 x 49

= 98

(iii)2m^3

= 2 x m x m x m

= 2 x (-7) x (-7) x (-7)

= 2 x (-343)

= -686

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