Q10 of 24 Page 115

If x y z are in AP then find the value of (x+y–z) (–x+y+z).

If x, y, and z are in AP, the differences between consecutive terms will be the same


⇒ y – x = z – y


⇒ 2y = x + z


……[1]


Now, (x + y – z)(–x + y + z)





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