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if f(x) =ax +b and g(x) = cx +d , then...

if f(x) =ax +b and g(x) = cx +d ,` then f[g(x) ] - g[f(x) ]`is equivalent to

A

`f(a) - g(c )`

B

`f(c ) + g(a) `

C

`f(d ) +g(b )`

D

`f(d ) -g (b) `

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The correct Answer is:
D
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