If x : y = 7 : 3, then the value of xy+y2x2−y2 is

A ) 3/4 ✅

B ) 5/6

C ) 3/7

D ) 6/8

Explanation: =xy=73=xy+y2x2−y2=(xy)+1(x2y2)−1=73+1(73)2−1=103×940=3/4
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