A curve is defined by the equation y=g(x)y = g(x)y=g(x). It is known that the curve has a point of inflection at x=−4x = -4x=−4. Given that g′(−4)=kg'(-4) = kg′(−4)=k and g′′(−4)=mg''(-4) = mg′′(−4)=m, where kkk and mmm are constants, identify which of the following statements must be true:
g′(−4)=0 g'(-4) = 0 g′(−4)=0 g′′(−4)=0 g''(-4) = 0 g′′(−4)=0 g′(−4)≠0 g'(-4) \neq 0 g′(−4)=0 g′′(−4)>0 g''(-4) > 0 g′′(−4)>0333 exam-style questions on WJEC A Level Maths 3.6 Differentiation (A-level only), covering 3.6.1 Differentiation (A-level only), 3.6.2 Differentiation (A-level only), 3.6.3 Differentiation (A-level only), 3.6.4 Differentiation (A-level only), 3.6.5 Differentiation (A-level only), 3.6.6 Differentiation (A-level only), 3.6.7 Differentiation (A-level only), and 3.6 Differentiation (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.