Ohhh rite rite so that’s y my Cher say my ans wrong. I just googled the diff between first and 2nd derivatives. I tot both meant the same thing as my Cher didn’t explain. Never tot it’ll be dis simple. Thx ah :)

First derivative is to find gradient, see whether the graph is upward or downward sloping, or whether theres stationary point.
Second derivative is to only check whether the stationary point is a maximum, minimum or stationary point of inflection

Ahhh I see. Tysm for teaching me :)))