Question

Use the formula to find the value of 102 x 98​

Answer 1

Answer:

Using the identity (x+a)(x+b) = x

2

+(a+b)x+ab

Writing 102 as 100+2 and 98 as 100−2

Hence (100+2)(100−2) = 100

2

+[2+(−2)]100+(2)(−2)

= 10000+(0)100−4

= 9996

The answer is 9996

Step-by-step explanation:

i hope this answer is right

Answer 2

Answer: 9996

Step-by-step explanation:

102x98

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

= 100²- 2²

= 10000 - 4

= 9996

KEY POINT : USE THE FORMULA

(a+b)(a-b) = a²-b². Here, we have taken a = 100 and b = 2.