anonymous
  • anonymous
I don't know if linear algebra was the right sub context but here it goes... how do I compute (f-h)(4) if f(x)=2x+5 and h(x)=7-x/3?
Linear Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
(f-h)(x)=2x+5 -(7-x/3) (f-h)(4)=2*4+5 -(7-4/3)
anonymous
  • anonymous
so it's 2/3?
anonymous
  • anonymous
22/3

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anonymous
  • anonymous
Ok. I do the stuff in the parenthesis first and come up with 2*4+5(-3/3), 2*4 is 8, 8+5=13(-3/3) which =-39/3 and that =-13. What did I do wrong?
anonymous
  • anonymous
Why are you multiplying anything against (-3/3)? \[(2)(4) +5-(7-4/3)\] \[8+5 -(21-4)/3\] \[13-17/3\] \[39/3-17/3=22/3\]
anonymous
  • anonymous
remember that 5-5 doesn't mean (5)(-5).
anonymous
  • anonymous
I forgot to do the 7*3 to make it 21/3 and -4/3... so I just subtracted -7-4 and divided that by 3. Thanks! I get so flustered with fractions that I make stupid mistakes!
anonymous
  • anonymous
Yeah, it happens a lot. Negative signs are everyone's bane.

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