Question

What is the derivative of `2x^2+x-1`?

Answer 1

4x + 1

Explanation:

using : f(x) = `ax^n color(black)("then") f'(x) = nax^(n-1 )`

Apply this to each term in turn to obtain derivative -

Remembering that the derivative of any constant is 0.

`d/dx (2x^2 + x - 1 ) = 4x + 1`