Question

. Given the number n, write an expression for:

(a) Twice the sum of n and 5
(b) The sum of twice n and 5

© Give a numerical example that shows these are not the same expression.

Answer 1

a) 2(n + 5)

b) 2n + 5

Explanation:

Writing an algebraic expression:

a) Sum of n and 5 ⇒ n + 5

Twice sum of n and 5 ⇒ 2*(n +5) = 2*n + 2*5

= 2n + 10

b) Twice n ⇒ 2*n = n

Sum of twice n and 5 ⇒ 2n + 5