Question

3. Find the products using suitable identity:
105 × 98

Answer 1

We need to find the value of:

105 x 98

We can re-write it as:

= (100+5) x (100 - 2)

Now, we can use the identity:

(a+b)(a-c) = a² +a(b-c) - bc

So, it becomes:

= 100² + 100(5-2) - (5)(2)

= 10000 + 300 - 10

= 10290

So, the answer is 10290 !