Question

8. Use the identity (a + b) (a - b) = a²- b² to find the following:
a) 983² - 17²
b)128² - 77²​

Answer 1

Answer:

a (983 +17 )(983 -17)= (1000)(966)= 966000

b (128+77)(128-77) = (205)(51) = 10455