For this case we have the following factorized expression:
![(2y-9) (2y-9)](https://tex.z-dn.net/?f=%282y-9%29%20%282y-9%29)
Applying distributive property we have:
![(2y) (2y) - (2y) (9) - (9) (2y) + (9) (9) =\\4y ^ 2-18y-18y + 81 =](https://tex.z-dn.net/?f=%282y%29%20%282y%29%20-%20%282y%29%20%289%29%20-%20%289%29%20%282y%29%20%2B%20%289%29%20%289%29%20%3D%5C%5C4y%20%5E%202-18y-18y%20%2B%2081%20%3D)
We add similar terms taking into account that: Equal signs are added and the same sign is placed.
![4y ^ 2-36y + 81](https://tex.z-dn.net/?f=4y%20%5E%202-36y%20%2B%2081)
ANswer:
![4y ^ 2-36y + 81](https://tex.z-dn.net/?f=4y%20%5E%202-36y%20%2B%2081)
If the interest earned for 4 years = $360, then the interest earned for 1 year would be $90 ($360/4). The interest rate would be 9% (or .09) which can be calculated by 90/1000=.09
The answer is 1 because you find the reciprocal of 2/8
First add 19 over so that you are left with z/4 by itself. Then to get z by itself multiply both sides by 4.