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If x=(a+4 and y=(a-4),show that xy=a square -16 ​
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If x=(a+4 and y=(a-4),show that xy=a square -16 ​

User Bitsy
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(a+4) (a-4)

according to formula,

x square - y square : (x+y) (x-y)

(a+4) (a-4)

xy : a square - 4

User Rosy
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