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# IIT JEE 2009 Mathematics Paper2 Code 1 Solutions

MATRIX MATCH TYPE

10.    Match the statements/expressions in Column I with the values given in Column II.

 Column I Column II (A) The number of solutions of the equation  xesinx - cosx = 0 in the interval (0, Π) (p) 1 (B) Value(s) of k for which the planes kx + 4y + z = 0, 4x + 5y + 2z = 0 and 2x + 2y + z = 0 intersect in a straight line (q) 2 (C) Value(s) of k for which |x-1| + |x-2| + |x+1| + |x+ 2| = 4k has integer solution(s) (r) 3 (D) If y' = y + 1 and y(0) = 1 then value (s) of y(ln2) (s) 4 (t) 5

Sol.   (A --> p); (B --> q, s); (C --> q, r, s, t); (D --> r)

(A)    f'(x) > 0, for all x belongs to (0, p/2)

F(0) < 0 and f(p/2) > 0

So one solution

(B)    Let (a, b, c) is direction ratio of the intersected line, then

ak + 4b + c = 0

4a + kb + 2c = 0

a/(8-k) = b/(4-2k) = c/(k2-16)

We must have 2 (8 - k) + 2 (4 - 2k) + (k2 - 16) = 0

=> k = 2, 4.

(C)    Let f(x) = |x+2| + |x+1| + |x-1| + |x-2|

=> k can take value 2, 3, 4, 5.

(D)    ∫ dy/(y+1) = ∫ dx

=> f(x) = 2ex - 1

=> f(ln2) = 3

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