Created by T. Madas
Question 24
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(
)
y = x 6x − 5 x , x ≥ 0 .
By showing all steps in the workings, find an expression for
y dx .
5
C1R , 2 x3 − 2 x 2 + C
Question 25
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Find the value of the constant a if
a
a − 2 x dx = −5 .
2
C2Q , a = 9
2
Created by T. Madas
Created by T. Madas
Question 26
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y
A ( −1,18)
y = 18 − x − x 4
R
O
B ( 2,0 )
x
The figure above shows the curve C with equation
y = 18 − x − x 4 .
The curve crosses the x axis at B ( 2,0 ) and the point A ( −1,18) lies on C .
The shaded region R is bounded by the curve and the straight line segment AB .
Find the area of the shaded region.
C2I , area = 18.9
Created by T. Madas
Created by T. Madas
Question 27
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1 1
−
, x∈», x > 0 .
x
x
y=
Show that the value of
d2y
dx
2
where x = 4 , is
1
.
128
proof
Question 28
(**+)
Find the value of the constant k if
3
6 x 2 + kx dx = 8 .
1
MP1-Q , k = −11
Created by T. Madas