Are you supposed to do all the ones in the quotations?
90 is the answer to that question
we have
![x^{2}-8x=3](https://tex.z-dn.net/?f=%20x%5E%7B2%7D-8x%3D3%20%20)
Complete the square. Remember to balance the equation by adding the same constants to each side
![x^{2}-8x+16=3+16](https://tex.z-dn.net/?f=%20x%5E%7B2%7D-8x%2B16%3D3%2B16%20%20)
![x^{2}-8x+16=19](https://tex.z-dn.net/?f=%20x%5E%7B2%7D-8x%2B16%3D19%20)
Rewrite as perfect squares
![(x-4)^{2}=19](https://tex.z-dn.net/?f=%20%28x-4%29%5E%7B2%7D%3D19%20)
![(x-4)^{2}=19\\ (x-4)=(+/-)\sqrt{19} \\ \\ x1=4+\sqrt{19} =8.359\\ x2=4-\sqrt{19} =-0.359](https://tex.z-dn.net/?f=%20%28x-4%29%5E%7B2%7D%3D19%5C%5C%20%28x-4%29%3D%28%2B%2F-%29%5Csqrt%7B19%7D%20%5C%5C%20%5C%5C%20x1%3D4%2B%5Csqrt%7B19%7D%20%3D8.359%5C%5C%20x2%3D4-%5Csqrt%7B19%7D%20%3D-0.359%20)
therefore
the answer is
![x1=4+\sqrt{19} =8.359\\x2=4-\sqrt{19} =-0.359](https://tex.z-dn.net/?f=%20x1%3D4%2B%5Csqrt%7B19%7D%20%3D8.359%5C%5Cx2%3D4-%5Csqrt%7B19%7D%20%3D-0.359%20%20)
Answer:
It would decrease, but not necessarily by 8%
I'm going to put it into decimals because it is easier.
3.5*1.5=5.25 or
![5 \frac{1}{4}](https://tex.z-dn.net/?f=5%20%5Cfrac%7B1%7D%7B4%7D%20)
Hope that helps