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Can anybody please help me show my work for these problems....I have the correct answer just no work to prove it...



1.Given f(x) = x2 + 2x, find f(a _ 3)

A: a^2-4a+3

  1. If f(x0=x/x-3 and g(x)=2x-1, find (f-g)(x)

A: -2x^2+8x-3/x-3

  1. If f(x)=x^2+1 and g(x)=1/x, find [f*g](x)

A:1/x^2 +1

  1. Which equation best represents a line perpendicular to the graph of x+3y=9?

A:y=3x-1

  1. Which of the following describes the graphs of 2x+5y=9 and 10x=4y+18?

A: perpendicular

  1. Write the standard form of an equation of the line parallel to the graph of x-2y-6=0 and passing through A(

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I hope this helps you

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syed514

1)
f(x) = x^2 + 2x

So lets replace all the x parts with (a-3)

f(a-3) = (a-3)^2 + 2(a-3)

and the rest is just expanding it out from there.
A: a^2-4a+3

2. If f(x0=x/x-3 and g(x)=2x-1, find (f-g)(x)
A: -2x^2+8x-3/x-3

3. If f(x)=x^2+1 and g(x)=1/x, find [f*g](x)
A:1/x^2 +1

4. Which equation best represents a line perpendicular to the graph of x+3y=9?
A:y=3x-1

5. Which of the following describes the graphs of 2x+5y=9 and 10x=4y+18?
A: perpendicular

6. Write the standard form of an equation of the line parallel to the graph of x-2y-6=0 and passing through A(-3,2)
 A: x-2y+7=0