- #1
jacksonpeeble
Gold Member
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- 2
Homework Statement
9.e. Solve the equation for x: x2*ex+x*ex-ex=0
19. If logxa=0.578 and logay=1.161, what is the value of logxy?
26. Use the fact that logb4=x and logb7=y to evaluate logb(64/49).
Homework Equations
9.e. x2*ex+x*ex-ex=0
19. logxa=0.578 and logay=1.161
26. logxa=0.578 and logay=1.161
The Attempt at a Solution
9.e. Factored equation so ex(x2+x-1), then plugged into quadratic equation so [tex]\frac{-1+-\sqrt{1^{2}-4*1*-1}}{2*1}[/tex] which equals [tex]\frac{-1+-\sqrt{5}}{2}[/tex]. However, I'm wondering exactly what to do with the initial ex that I factored out - the answer key we were provided with does not include it at all, but I assumed that we would pin it in front of the equation so that our final answer is ex*[tex]\frac{-1+-\sqrt{5}}{2}[/tex].
19. I remember doing these and that the solution is fairly obvious, I just forget what it is.
26. Sorry, this is one where I have no idea.