anonymous
  • anonymous
Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of f[g(−4)]? −12 3 −13 8
Mathematics
katieb
  • katieb
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ganeshie8
  • ganeshie8
first find \(g(-4)\)
ganeshie8
  • ganeshie8
\(g(x) = x+5\) \(g(-4)=?\)
anonymous
  • anonymous
x-20?

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ganeshie8
  • ganeshie8
Nope, you need to replace "x" by "-4"
anonymous
  • anonymous
I am confused.
ganeshie8
  • ganeshie8
Easy, \(g(x) = x+5\) \(g(-4)=-4+5 = 1\)
ganeshie8
  • ganeshie8
\(f(g(-4)) = f(1) = ?\)
ganeshie8
  • ganeshie8
find the value of \(f(1)\) and you're done!
anonymous
  • anonymous
Is it D?????? 8?????????????
ganeshie8
  • ganeshie8
nope, don't guess haha
anonymous
  • anonymous
._.
ganeshie8
  • ganeshie8
\(f(x)=x^2-13\) \(f(1)=?\)
ganeshie8
  • ganeshie8
replace \(x\) by \(1\) on right hand side expression
anonymous
  • anonymous
So -12?????
ganeshie8
  • ganeshie8
Yes!
anonymous
  • anonymous
THANK YOU!!!!!!
ganeshie8
  • ganeshie8
np
anonymous
  • anonymous
@ganeshie8 can you check 1 for me?
anonymous
  • anonymous
If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? The value of a is _____________. Numerical Answers Expected! Answer for Blank 1:
anonymous
  • anonymous
Is it 81??
ganeshie8
  • ganeshie8
Correct!
anonymous
  • anonymous
Oh okay thank you so much!
ganeshie8
  • ganeshie8
yw

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