Question

Twice a number k plus the quantity s minus 2

Answer 1

2k + s - 2                        
Twice the no. k = 2k
Plus the quantity s = +s
Minus 2 = -s          

Answer 2

Required expression = 2k + s - 2

Explanation:

Let us find the quantitative values of the numbers first.

• 1st quantity = twice of k = 2k

• 2nd quantity = only s = s

• 3rd quantity = only 2 = 2

The given algebraic operations are such as

(quantity)₁ + (quantity)₂ - (quantity)₃

Therefore the required expression is

= 2k + s - 2

Try these yourself:

1. Find an expression for thrice of s, added with twice of t and subtraction of 9.

[ Ans. 3s + 2t - 9 ]

2. Express (7k - 2s + 9) in words.