Question

Evaluate using identity 105 x 98 step by step explanation

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 !

Answer 2

Answer:

Step-by-step explanation:

105 x 98

Using the identity (x)² + (a-b)x - ab

(100+5) (100-2)

= (100)² + (5-2)100 - (5)(2)

= 10,000 + 300 - 10

= 10,290