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Question

If Δ1=∣ ∣7x25x+134x7∣ ∣,Δ2=∣ ∣x27x+135x74∣ ∣ then Δ1Δ2=0 for

A
x=2
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B
all real x
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C
x=0
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D
none of these
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Solution

The correct option is D all real x
Given, Δ1=∣ ∣7x25x+134x7∣ ∣
C1C2
Δ1=∣ ∣x72x+153x47∣ ∣
C2C3
=∣ ∣x27x+135x74∣ ∣
=Δ2
Δ1=Δ2 for all real x

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