Question

Using suitable identity evaluate:
a) ( 30)SQUARE- (20)SQUARE
b) 78 x 82

Answer 1

Answer:

A.

30²-20²=900-400= 500

Answer 2

Answer:

i) (30)² - (20)²

(30 + 20)(30 - 20)

50×10

500

ii) 78×82

(80 - 2)(80 + 2)

(80)² - (2)²

6400 - 4

6396

Step-by-step explanation:

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