I have a few homework questions that I just don't understand. It would be greatly appreciated if you show me step by step how you got them, thank you very much!!
1) Solve for H--- S= 2(hw+hl+wl)
2) Solve for P---- A=P+ Prt
3) Solve the equation (4/4x+9)+ (7/4x-9)= 44x+27/16x^2-81
4) Solve the equation (2/5x+4)-(4/10x+8)
I presume this equation is
(Please be more careful in your use of parenthesis!)
First you want to get a common denominator for all terms. In this case it is going to be simple because
So
<-- Now multiply both sides by :
or
So it looks like any value of x will solve the equation, since both sides are already equal. BUT, look at the original equation:
From here it is clear that we are restricted by the denominators: we must not have . Other than that, the solution is any x.
-Dan
Same comment about the parenthesis as I made above. If this is supposed to be
you need to write it as 2/(5x + 4) - 4/(10x + 8).
This is not an equation, so it cannot be solved. I presume the question is to perform the indicated operation.
Note that , thus
(Your Math teacher likes, zeros doesn't (s)he?)
-Dan
I don't know what to tell you about number 3. I just plugged it into my calculator and the calculator agrees. However note that the answer here is not x = 0, it is any x such that x is not 4/9 or -4/9. I don't know how you would plug that into the computer.
As far as number 4 is concerned, you originally told me to "solve the equation." Did you leave something out of the problem?
-Dan
Now I'm confused. Re-reading the posts will give you the answer you seek:
I'm not sure what more I can say to make the final answers clearer...
-Dan