monkey*
  • monkey*
Given f(x)=-x^2+2x, find f(-3).
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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monkey*
  • monkey*
Help?
Nnesha
  • Nnesha
f(-3) means x=-3 so substitute all x's for -3
monkey*
  • monkey*
So, f(-3)=-3^2+2(-4) ?

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More answers

monkey*
  • monkey*
(-3)**
Nnesha
  • Nnesha
yes right remember coefficient is also negative so \[\huge\rm -(-3)^2+2(-3)\] now solve
monkey*
  • monkey*
3?
Nnesha
  • Nnesha
hmm no (-3)^2 =?
monkey*
  • monkey*
-6?
Nnesha
  • Nnesha
(-3)^2 is same as -3 times -3
monkey*
  • monkey*
9.
Nnesha
  • Nnesha
yes right so-(9)+2(-3) = ?
monkey*
  • monkey*
I got -15.
Nnesha
  • Nnesha
right
monkey*
  • monkey*
Would that be my final answer?
Nnesha
  • Nnesha
yes
monkey*
  • monkey*
Okay, would you mind helping me with just one more?
Nnesha
  • Nnesha
i'll try
monkey*
  • monkey*
If f(x)=x-3 and g(x)=2x-4, find (f+g)(x).
monkey*
  • monkey*
I tried working this one out and got 3x-7. Which I don't think is right.
Nnesha
  • Nnesha
just one question how did you get 3x :=)
monkey*
  • monkey*
I have no idea honestly. Haha
Nnesha
  • Nnesha
so how did you get 3x-7 ?
monkey*
  • monkey*
At the end how it has f+g and then x. I think that's how I got the x. Can you help?
Nnesha
  • Nnesha
(f+g)(x) means add both function f(x) and g(x) so f(x) + g(x)
Nnesha
  • Nnesha
so replace f(X) with x-3 and f(x) with 2x-4 and then combine like terms (x-3)+(2x-4)
monkey*
  • monkey*
Wouldn't you add the x to 2x and it becomes 3x?
Nnesha
  • Nnesha
yes right that's what i was asking
Nnesha
  • Nnesha
good job!
monkey*
  • monkey*
Thank you, so now the -3 and -4¿
monkey*
  • monkey*
?
Nnesha
  • Nnesha
yes right -3-4 are like terms
monkey*
  • monkey*
Would it be -7?
monkey*
  • monkey*
Ohh, would my answer actually be 3x-7?
Nnesha
  • Nnesha
yes right
monkey*
  • monkey*
Thank you so much for the help!
Nnesha
  • Nnesha
yw :=)

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