for question 7(a):
basically differentiate and find your turning points.
for a cubic, if there are three distinct roots then u have a max and min turning point
therefore f(x-value for max)*f(x-value for min)<0
after that it's a piece of cake
with 7(a)(i) just draw a diagram and do some...
hey could you send me some trial papers for legal??
ive only got trial papers for eng paper 1 as adv and standard does the same paper for that and 2u if ur interested??
email: handred_million@hotmail.com