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If f: Rvec is defined by f(x)=2x+7. Prov...

If `f: Rvec` is defined by `f(x)=2x+7.` Prove that `f` is a bijection. Also, find the inverse of `fdot`

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`f(x)=2 x+7`
For one-one :
`f(x_{1}) =f(x_{2}) `
`2 x_{1}+7 =2 x_{2}+7 `
...
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