Math AA SL: Solving Equations

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[Maximum Marks: 8]

A quadratic f can be written in the form f(x)=a(x-p)(x-4). 
The graph of f has axis of symmetry x=3 and y-intercept at (0,8).

a) Find the value of p.

b) Find the value of a. 

c) The line y=-kx+4 is a tangent to the curve of f. Find the values of k. 
Detailed Answer/Video Explanations Answer
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[Maximum Marks: 7]

Let f(x)=x^2-x-2 and g(x)=x-4.

a. Find f(8).

b. Find (g \circ\ f)(x).

c. Solve (g \circ\ f)(x)=0.
Detailed Answer/Video Explanations Answer
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[Maximum Mark: 15]

Two savings accounts, A and B, are created at the same time.
The value of account A, in millions of dollars, after t years, is modeled by the function A(t)=6e^{0.35t}.

a) Find the value of account A when it was made.

b) Find the value of account A after 6 years.

c) How long does it take for the value of account A to reach 300 million dollars?

d) The value of account B, in millions of dollars, after t years, is modeled by the function B(t)=12e^{kt}. 
After 10 years, the value of the account is 38 million dollars. 
Find the value of k.

e) After n years, the value of account A surpasses that of account B. 
Find the value of n.
Detailed Answer/Video Explanations Answer
#MAASL00238

[Maximum Marks: 8]

Let f(x)=3x^2-7x+5 and g(x)=x-2,for x\inR.

a) Find f(8).

b) Find (g \circ\ f)(x).

c) Solve (g \circ\ f)(x)=0.
Detailed Answer/Video Explanations Answer
#MAASL00239

[Maximum Marks: 8]

A quadratic f can be written in the form f(x)=a(x-p)(x-6). 
The graph of f has axis of symmetry x=4 and y-intercept at (0,9).

a) Find the value of p.

b) Find the value of a. 

c) The line y=-kx+3 is a tangent to the curve of f. Find the values of k. 
Detailed Answer/Video Explanations Answer
#MAASL00240

[Maximum Mark: 8]

Consider the following functions:

f(x)=kx^{2}+kx and g(x)=x-0.4

If the graphs of the functions intersect at two distinct points, what are the possible values of k?
Detailed Answer/Video Explanations Answer
#MAASL00241

[Maximum Mark: 8]

Consider the following functions:

f(x)=kx^{2}+kx and g(x)=x-1.3

If the graphs of the functions intersect at one distinct point, what are the possible values of k?
Detailed Answer/Video Explanations Answer
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[Maximum Mark: 6]

If f(x)=x^{2}+4x-21:

a) Solve f(x)=0

b) Solve f(x)=12
Detailed Answer/Video Explanations Answer
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[Maximum Mark: 6]

If f(x)=x^{2}-3x-18:

a) Solve f(x)=0

b) Solve f(x)=7
Detailed Answer/Video Explanations Answer
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[Maximum Mark: 15]

Two animal populations, A and B, are tracked over the same time period.
The population of A, in thousands, after t years, is modeled by the function A(t)=13e^{0.29t}.

a) Find the value of account A when it was made.

b) Find the value of account A after 4 years.

c) How long does the population of A take to reach 130,000?

d) The population of B, in thousands, after t years, is modeled by the function B(t)=8e^{kt}. 
After 7 years, the population of B is 90,000. 
Find the value of k.

e) After n years, population B surpasses population A. 
Find the value of n.
Detailed Answer/Video Explanations Answer

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