2 -3 If A= then adj (3A2 12A) is equal to JEE MAINS 2017 72-84 (1)-63 51 51 63 (2) 84 72 51 84 63 72 72 -63 (4) -84 51 342-9A = 301 2 3 -4 1 Sol. A= 342 + 12A = 301 + 21 A 2- -3 30 0 0 308421 72 -63 -84 51 42 -63 IA-All = f(A) 2-32-10 51 63 .. A satisfies f(X) adj(3A2 +12A) = 84 72 A2-3A-10/ = 0 Answer (2)

Let be a complex number such that 2 + 1 = z where z=V-3 . If MAINS 2017 11 1 -of-1 of JEE 3k, then k is equal to (4) 1 C0 2 Sol. 2() + 1 = z , z = V3i Cube root of unity 2 1-1-0,-0) 3V3i =11 10 k =-z

If S is the set of distinct values of b for which the following system of linear equations x + y + z = 1 (1) An empty set (2) An infinite set ax + by + z = 0 has no solution, then s is (3) A finite set containing two or more elements (4) A singleton JEE MAINS x + ay + z = 1 2017 -(1-a)2-0 a-1 For a = 1 Eq (1) & (2) are identical ie., x y + z = 1 To have no solution with x + by + z = 0 x+y+z=1 x + ay + z = 1 Sol. (ii) (iii) ax + by + z 0 D=0 Answer (4)

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Shivam Gupta

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Seema Choudhary

a year ago

thank u sir

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Pavan Choudhary

a year ago

thnx

Rahul Kumar

2 months ago

how value of umega square is acting as conjugate in 2nd question

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Muskan Jaiswal

5 months ago

Sir is question me simple tarike se nhi kr sakte jaise 3A square and 12A Square nikalne ke baad kre fir uska adjoint nikale but aise answer nhi aa rha

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Evil Gemini

5 months ago

sir plz differential equation ka banaiye na

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Muskan Jaiswal

5 months ago

sorry 12A hai square nhi sir

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Nagendar

6 months ago

I need matrix questions

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