59.99 - 59.99 x saving rate = 42.89
with saving rate = r%
59.99 - 59.99 x r% = 42.89
so 59,99 ( 1 - r%) = 42.89
1 - r% = 42.89 : 59.99
1 - r% = 0,7150
r% = 1 - 0,7150
r = 28,5%
Answer:
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To solve this, we have to complete the square of ![x^{2} +2x](https://tex.z-dn.net/?f=x%5E%7B2%7D%20%2B2x)
To do this with halve the
and get rid of the x, then get rid of the power on
, and then put them all in brackets, and the square the bracket, like so:
becomes ![(x+1)^{2}](https://tex.z-dn.net/?f=%28x%2B1%29%5E%7B2%7D)
However
does not equal
If we expand
we get
instead.
So to make it equal, all we do is subtract 1.
So when we complete the square of
, we get ![(x+1)^{2}-1](https://tex.z-dn.net/?f=%28x%2B1%29%5E%7B2%7D-1)
---------------------------------------------------------
So
becomes:
![(x+1)^{2}-1-5=0](https://tex.z-dn.net/?f=%28x%2B1%29%5E%7B2%7D-1-5%3D0)
![(x+1)^{2}-6=0](https://tex.z-dn.net/?f=%28x%2B1%29%5E%7B2%7D-6%3D0)
![(x+1)^{2}=6](https://tex.z-dn.net/?f=%28x%2B1%29%5E%7B2%7D%3D6)
x + 1 = ±√6
x = -1 ± √6
______________________________
Answer:
x = -1 ± √6
Answer:
-38.33333333333333333333333334