The value of a for which the system of equations; a3x + (a +1)3 y + (a + 2)3 z = 0 , ax + (a + 1) y + (a + 2) z = 0 & x + y + z = 0 has a non-zero solution is :
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a
1
b
0
c
-1
d
None of these
answer is D.
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Detailed Solution
Use C2→C1&C3→C3−C2 then open by R3 a3(a+1)3(a+2)3aa+1a+2111 C2→C2-C1,C3→C3-C2 a33a2+3a+13a2+9a+7a11100 a33a2+3a+16a+7a10100=-(6a+7)=0