anonymous
  • anonymous
What statement correctly describes the key features of the graph of f(x) = 4(1/2)^(x + 1) − 3? Y-intercept of (0, −1), starts up on the left, gets closer to y = −3 on the right Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right Y-intercept of (0, 1), starts up on the left, gets closer to y = −3 on the right Y-intercept of (0, 1), starts down on the left, gets closer to y = −3 on the right
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@Albany_Goon
welshfella
  • welshfella
to work out the y intercept put x = 0 into f(x) and work it out
welshfella
  • welshfella
= 4(1/2)^(0+1) - 3 = ?

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anonymous
  • anonymous
Okay did it now how do I solve?
welshfella
  • welshfella
what value did you get ?
welshfella
  • welshfella
= 4(1/2)^(0+1) - 3 = 2^1 - 3
anonymous
  • anonymous
-1
welshfella
  • welshfella
right
anonymous
  • anonymous
Now what?
welshfella
  • welshfella
so work out some values of f(x) for negative x's like x = -2 2 f(-2) = 4 (1/2)^(-2+1) - 3 = 4 / (1/2) -3 = 5 f(-3) = 4(1/2)^-2 - 3 = 4 / 1/4 - 3 = 13 so the left side of the curve will descend pretty steeply
anonymous
  • anonymous
Oh okay so what's next?
welshfella
  • welshfella
|dw:1435686232852:dw|
anonymous
  • anonymous
So B
welshfella
  • welshfella
for high values of x the curve will tend to approach -3 because 1/2 to a high power will approach zero and that leaved - 3
welshfella
  • welshfella
i'm not sure - i thought it would be up on the left
welshfella
  • welshfella
|dw:1435686456854:dw|
anonymous
  • anonymous
So A or B?
welshfella
  • welshfella
it starts at high value of f(x) on the left so i think it starts 'up on the left' what do you think?
welshfella
  • welshfella
I would go for A
anonymous
  • anonymous
A
welshfella
  • welshfella
yeah
anonymous
  • anonymous
if i tag u can u help me with two more?
welshfella
  • welshfella
i cant at the moment. I have to go right now.

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