Question 3 - A-Level Maths

Exam Board	OCR
Module	C1 (Core Mathematics 1)
Topic	Differentiation Applications
Type	Increasing/decreasing intervals

3. $$f ( x ) = x ^ { 3 } + 4 x ^ { 2 } - 3 x + 7$$ Find the set of values of $x$ for which $\mathrm { f } ( x )$ is increasing.