Question

C) Workout using factorization. Show all your working. 9.9²- 0.1²​

Answer 1

98

Explanation:

1) You shulduse the formula x^2-y^2= (x-y)(x+y)

That obvious, that 9.9 is considered as x, and 0.1 as y

2) So 9.9²- 0.1²​= (9.9-0.1) * (9.9+0.1)=9.8*10=98