If √{(x -1)(y+2)} = 7 and x and y are positive whole numbers, their values respectively are (a) 8,5 (b) 15,12 (c) 22,19 (d) None of these

Question

If \(\sqrt {(X-1)(y+2)}\) = 7 and x and y are positive whole numbers, their values respectively are

(a) 8, 5

(b) 15, 12

(c) 22, 19

(d) None of these

Answer 1

Correct option is (A) 8, 5

\(\sqrt{(x - 1)(y + 2)} = 7\)

⇒ (x − 1) (y + 2) = 7²

⇒(x − 1) = 7 and (y + 2) = 7

x = 8 and y = 5

Answer 2

The answer is: (a) 8, 5