x(x-7)=-49 ???

Question

x(x-7)=-49 ???

anonymous · Answer

Okay - let's multiply out the left side.
$$x ^{2}-7x=-49$$

Then we'll make a traditional equation set to 0 by adding 49 to both sides:
$$x ^{2}-7x+49=0$$

Now we have to use the quadratic equation (because no two numbers, when multiplied by each other = 49, and when added to each other=-7)

$$(-b \pm \sqrt{b ^{2}-4ac})/2a$$

From our traditional equation, a=1, b=-7, and c=49
so we have $$(-(-7)\pm \sqrt{-7^{2}-4*1*49})/2*1$$


That's all just numbers, so see what you can do with it..

anonymous · Answer

oh that way i ended up with the x's on one side and didnt know what to do afterwards :p

anonymous · Answer

thanks

anonymous · Answer

amist...did I do that right?  I think I get a complex number out of that mess...

amistre64 · Answer

you did it right :)

anonymous · Answer

huh??
isnt that equation i just need to put inot my calculator?

amistre64 · Answer

there are no 'real' solutions lol

anonymous · Answer

oh :o

amistre64 · Answer

sqrt(-#) is not answerable in an R^2 line up

anonymous · Answer

didn't seem like a complex question....I think you may have mistyped the question, MissM, because there is not a real solution to this equation, and from what I recall I am not sure it is applicable to the level of math you are studying.  What class is this for?