evaluate the following products without multiplying directly.
(A) 93 X 95
(B) 78 X 84
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Answered by
7
Answer:
(A) 93 X 95
93×(100-5)
(93×100)-(93×5)
9300-465
8835
(B) 78 X 84
84×(80-2)
(84×80)-(84×2)
6720-168
6552
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Answered by
1
A) 93 × 95
(90+3 ) (90+5)
Using Identity (x +a) ( x-b ) =x² +(a+b)x +ab
Where x = 90, a=3 and b=5
= (90) ² +(3+5 ) (90) + (3×5)
=8100 +(8 ) (90) + ( 15)
=8100 + 720 + 15
= 8835
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