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Show that the function given by f(x) = 7...

Show that the function given by `f(x) = 7x-3` is strictly increasing on R.

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Here is the solution:
Given, ` f(x)=7x−3` for `x∈R`.
Now, `f ′(x)=7gt0`.
This gives that the function f(x) is strictly increasing on R.
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