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Exponential graphs - Quiz 2   Last unanswered question  Question  Next unanswered question

Question 1 lion

What is the value of the function   f(x) = e2x+3   when x = -1 ,   correct to 3 decimal places?
a) 3.135.   b) 148.413.
c) 2.718.   d) 10.389.

 

Not correct. Choice (a) is false.
Try again, you have calculated   e-2 + 3.
Not correct. Choice (b) is false.
Try again, you have calculated   e2+3.
Your answer is correct.
f(- 1) = e-2+3 = e = 2.718
Not correct. Choice (d) is false.
Try again, you have calculated   e2 + 3.
Question 2 lion

Which of the following graphs represents   y = e-x?
a) y = f(x)
PIC		   b) y = f (x)
PIC
c) y = f(x)
PIC		   d) y = f(x)
PIC

 

Your answer is correct.
This is   y = e- x.
Not correct. Choice (b) is false.
Try again, this is   y = - ex .
Not correct. Choice (c) is false.
Try again, this is   y = ex.
Not correct. Choice (d) is false.
Try again, this is   y = - e- x.
Question 3 lion

Which of the following graphs represents   y = - 2ex ?
a) y = f(x)
PIC		   b) y = f (x)
PIC
c) y = f(x)
PIC		   d) y = f(x)
PIC

 

Not correct. Choice (a) is false.
Try again, this is   - x y = - 2e .
Your answer is correct.
This is   x y = - 2e .
Not correct. Choice (c) is false.
Try again, this is   x y = 2e .
Not correct. Choice (d) is false.
Try again, this is   -x y = 2e .
Question 4 lion

Which of the following graphs represents   x y = e + 2 ?
a) y = f(x)
PIC		   b) y = f(x)
PIC
c) y = f(x)
PIC		   d) y = f(x)
PIC

 

Not correct. Choice (a) is false.
Try again, this is   y = ex+1,   the graph   y = ex   has been moved 1 unit left.
Not correct. Choice (b) is false.
Try again, this is   y = ex-2,   the graph   y = ex   has been moved 2 units right.
Not correct. Choice (c) is false.
Try again, this is the graph   y = ex + 2,   the graph   y = ex   has been moved two units up.
Your answer is correct.
This is   y = ex - 2,   the graph   y = ex   has been moved two units down.
Question 5 lion

Which of the following functions increases most rapidly when   x > 0.
a) f(x) = ex .   b) f(x) = e 12x .
c) f(x) = e2x.   d) -3x f(x) = e .

 

Not correct. Choice (a) is false.
Try again, this function increases rapidly, but not most rapidly.
Not correct. Choice (b) is false.
Try again, this function increases rapidly, but not most rapidly.
Your answer is correct.
PIC
Not correct. Choice (d) is false.
Try again, this function decreases when x > 0.