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Answer:
215² = x(x+1)100 + 5²
215²-5² = (x²+x)100
(215+5)(215-5) = (x²+x)100
462 = x²+x = 21²+21
x = 21
similarly,
405² = y(y+1)*100+5²
(405+5)(405-5) = y(y+1)*100
164000 = y(y+1)*100
1640 = y(y+1) = 40(40+1)
Y = 40
so,
x*y = 21*40 = 840 (Ans.)
[ mark as brainlist ]
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Answer:
c is answer of this questions
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