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Question

Prove that :

x+4xxxx+4xxxx+4=16 3x+4

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Solution

Let LHS =Δ=x+4 x xx x+4 xx x x+4=3x+4 3x+4 3x+4x x+4 xx x x+4 Applying R1 R1+R2+R3 =3x+4 1 1 1x x+4 x x x x+4 Taking out 3x+4 common from R1=3x+4 1 0 0x 4 0x 0 4 Applying C2C2-C1 and C3C3-C1=3x+4 42 Expanding along R1=163x+4 =RHS

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