MEDIUM
AS and A Level
IMPORTANT
Earn 100

By sketching a suitable pair of graphs, show that the equation e2x+1=14-x3 has exactly one real root. Show by calculation that this root lies between 0.5 and 1.

Important Questions on Numerical Solutions of Equations

MEDIUM
AS and A Level
IMPORTANT
By sketching a suitable pair of graphs, show that the equation e2x+1=14-x3 has exactly one real root. Show that this root also satisfies the equation x=ln14-x3-12
MEDIUM
AS and A Level
IMPORTANT
Use an iteration process based on the equation x=ln14x312  with a suitable starting value, to find the root correct to 4 decimal places. Give the result of each step of the process to 6 decimal places.
MEDIUM
AS and A Level
IMPORTANT
The sequence of values given by the iterative formula xn+1=xn1+sec2xn-tanxnsec2xn-1 with initial value x1=1, converges to α.
Use this formula to find α correct to 2 decimal places, showing the result of each iteration to 4 decimal places.
MEDIUM
AS and A Level
IMPORTANT
The sequence of values given by the iterative formula xn+1=xn1+sec2xn-tanxnsec2xn-1 with initial value x1=1, converges to α.
Show that α also satisfies the equation tanx-2x=0 where 1x<π2.
EASY
AS and A Level
IMPORTANT

The equation lnx2-62=x-5 has a root α, such that p<α<q, where p and q are consecutive integers.

Show that α also satisfies the equation x=lnx+2.

EASY
AS and A Level
IMPORTANT

The equation lnx2-62=x-5 has a root α, such that p<α<q, where p and q are consecutive integers.

Find the value of p and the value of q.

MEDIUM
AS and A Level
IMPORTANT

The equation lnx2-62=x-5 has a root α, such that 3<α<4. Use the iterative formula based on the equation x=lnx+2 with starting value x=3 to find the value of α correct to 3 decimal places.

MEDIUM
AS and A Level
IMPORTANT

Use iterative formula based on the equation 5y-2=yln5α is a root with a starting value of y=0.5 to find the value of α correct to two decimals. Use ln5=1.609437912