using the identity for difference of two squares , find the values of : 18 × 22 , 84^2-76^2
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Answered by
13
18×22=(20-2)(20+2)=20^2-2^2=400-4=396
84^2-76^2= (84-76)(84+76)= 8×160= 1280
84^2-76^2= (84-76)(84+76)= 8×160= 1280
Answered by
1
Answer:
396
Step-by-step explanation:
we can write 18 as (20-2) and 20 as (20+2)
Therefore,
(20-2)×(20+2)
=20²-2²
=400-4
=396 ans
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