Whitout actual calculation find the value of 21 square - 20 square
Answers
Answered by
2
given
(21)^2-(20)^2
use the identity
a^2-b^2=(a+b)(a-b)
so
(21-20)(21+20)
(1)(41)
ans is 41
(21)^2-(20)^2
use the identity
a^2-b^2=(a+b)(a-b)
so
(21-20)(21+20)
(1)(41)
ans is 41
Answered by
0
(21)^2-(20)^2
=(21+20)(21-20)
=41*1
=41
=(21+20)(21-20)
=41*1
=41
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