Hey everyone. I've just started A-level maths and I'm a bit stuck on Quadratic Functions. Wondered if anyone could help me.
The question I dont get is:
What have you tried?
To expand $\displaystyle (3x+1)^2$, use the (important) special product $\displaystyle (a+b)^2=a^2+2ab+b^2$ and afterwards simplify.