Suppose a, b, c and x are real numbers. Let Δ=1+a1+ax1+ax21+b1+bx1+bx21+r1+rx1+rx2 .Then ∆ is independent of
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a
a,b,c
b
x
c
a,b,c,x
d
none of these
answer is C.
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Detailed Solution
Write Δ=Δ1+Δ2, where Δ1=11+ax1+ax211+bx1+bx211+cx1+cx2and Δ2=a ax ax2b bx bx2c cx cx2=0 ∵C1 and C2 are propotional In Δ1,use C2→C2−C1,C3→C3−C1 to obtainΔ1=1axax21bxbx21cxcx2=0 ∵C2 and C3 are propotional Thus Δ=0 and hence independence a,b,c,x.