SOLUTION: Hi, I have been having some trouble with my algebra home work and I am a little behind. I have three questions I hope you can help me with. 1. Convert to scientific notation (he

Question 139064: Hi, I have been having some trouble with my algebra home work and I am a little behind. I have three questions I hope you can help me with.
1. Convert to scientific notation (here you may use x as multiplication):
0.00083
2. For f(x) = 6x � 7, find f(2).

3. Perform the indicated operations:
(-x2 � 6x + 3) � (-9x2 + x � 1) � (x2 + 5x � 2)
Iwould like to thank you in avance for all your help and all the help you have giving me so far.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
1. Convert to scientific notation (here you may use x as multiplication):
0.00083
Move the decimal 4 places to the right, and you have 8.3(10^-4)
:
2. For f(x) = 6x � 7, find f(2)
f(2) just means substitute 2 for x.
f(2) = 6(2) - 7
f(2) = 12 - 7
f(2) = 5
:
3. Perform the indicated operations:
(-x2 � 6x + 3) � (-9x2 + x � 1) � (x2 + 5x � 2)
:
Remove the brackets, remember a neg outside the brackets, change the signs:
-x^2 - 6x + 3 + 9x^2 - x + 1 - x^2 - 5x + 2
;
Group like terms
-x^2 + 9x^2 - x^2 - 6x - x - 5x + 3 + 1 + 2
:
7x^2 - 12x + 5
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