anonymous
  • anonymous
Let f(x) = 2x^2 − 9x and g(x) = -5x^2 + 4x. Find f(x) − g(x). a)-3x^2-13x b)-3x^2-5x c)7x^2-13x d)7x^2-5x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Ness9630
  • Ness9630
Subtract the two functions
Ness9630
  • Ness9630
|dw:1378419906967:dw|
anonymous
  • anonymous
how would i do that? 2x^2-1(-5x^2)-4x-4x 2x^2+5x^2-4x-4x 7x^2-4x-4x 7x^2-0 Why am i getting the wrong answer? What am i doing wrong?

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anonymous
  • anonymous
@Ness9630
Ness9630
  • Ness9630
Oops, sorry excuse my bad writing, that's suppose to be a -9x-4x
anonymous
  • anonymous
oh, sorry. i should've caught that. so the answer is 7x^2-5x?
Ness9630
  • Ness9630
Noo.. -9-4 is not -5, is it?
Ness9630
  • Ness9630
|dw:1378421353949:dw|
anonymous
  • anonymous
or is it 7x^2-13x because you have to add the two negatives
Ness9630
  • Ness9630
Yupp
anonymous
  • anonymous
okay, so can you help me with this....: given the function f(x)=3x^2-4, what is f(-2)? A) -40 B)-16 C)8 D)32
Ness9630
  • Ness9630
Just plug in -2
anonymous
  • anonymous
where do I plug it in at?
anonymous
  • anonymous
@Ness9630
Ness9630
  • Ness9630
where ever you see any x
anonymous
  • anonymous
so, -16?
anonymous
  • anonymous
@Ness9630
Ness9630
  • Ness9630
8..

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