Created by T. Madas
Question 132
(***+)
Find the exact value of
3
1
3 x−
4
dx ,
x
giving the answer in the form p + q 3 , where p and q are integers.
6−2 3
Created by T. Madas
Created by T. Madas
Question 133
(***+)
A curve C has equation
y = 4 x3 + 7 x 2 + x + 11 , x ∈ » .
The point P lies on C , where x = −1 .
a) Find an equation of the tangent to C at P .
The tangent to C at P meets C again at the point Q .
b) Determine the x coordinate of Q .
MP1-A , y = 12 − x , xQ = 1
4
Created by T. Madas
Created by T. Madas
Question 134
(***+)
2
A triangle PQR has PQ = x + 2 cm , QR = ( 2 − x ) cm and
PQR = 30° .
a) Show that the area of the triangle, A cm 2 , is given by
(
)
A = 1 x3 − 2 x 2 − 4 x + 8 .
4
b) Determine the value of x for which A is stationary and hence find, with
justification, the greatest value of A .
SYN-P , x = − 2 , Amax = 64 ≈ 2.37
3
27
Created by T. Madas