X³ - 9x² + 5x - 45
x²(x - 9) - 5(x - 9) ⇒ x³ - 9x² - 5x + 45 INCORRECT
x²(x + 9) - 5(x + 9) ⇒ x³ + 9x² - 5x - 45 INCORRECT
x(x² + 5) - 9(x² + 5) ⇒ x³ + 5x - 9x² - 45 CORRECT
It just needs to be rearranged.
x(x² - 5) - 9(x² - 5) ⇒ x³ - 5x - 9x² + 45 INCORRECT
Answer:
4.
l=22cm
b:16cm
h:10cm
surface area =2(lb+bh+lh)=2(22*16+16*10+22*10)
=1464cm²
5.
a=2.5dm
area cubical soda cracker box=6a²=6*2.5²=37.5dm²
6.
r=1.5dm
area of ball=4πr²=4π×1.5²=28.27dm² per ball
for 10 bal =28.27×10=282.6dm²
Step-by-step explanation:
![w = \frac{1}{2} {x}^{2} y \\ (2)w = \frac{1}{2} {x}^{2} y(2) \\ 2w = {x}^{2} y \\ \frac{2w}{ {x}^{2} } = \frac{{x}^{2} y}{ {x}^{2} } \\ \frac{2w}{ {x}^{2} } = y](https://tex.z-dn.net/?f=w%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20%20%7Bx%7D%5E%7B2%7D%20y%20%5C%5C%20%282%29w%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20%20%7Bx%7D%5E%7B2%7D%20y%282%29%20%5C%5C%202w%20%3D%20%20%7Bx%7D%5E%7B2%7D%20y%20%5C%5C%20%20%5Cfrac%7B2w%7D%7B%20%7Bx%7D%5E%7B2%7D%20%7D%20%20%3D%20%20%20%5Cfrac%7B%7Bx%7D%5E%7B2%7D%20y%7D%7B%20%7Bx%7D%5E%7B2%7D%20%7D%20%5C%5C%20%5Cfrac%7B2w%7D%7B%20%7Bx%7D%5E%7B2%7D%20%7D%20%3D%20y)
<h3>Answer:</h3>
![y = \frac{2x}{ {x}^{2} } \\](https://tex.z-dn.net/?f=y%20%3D%20%20%5Cfrac%7B2x%7D%7B%20%7Bx%7D%5E%7B2%7D%20%7D%20%20%5C%5C%20)