Answer:
swimming pool
Step-by-step explanation:
Answer:
x=9,-1 and ![x^2+(-8)x=9](https://tex.z-dn.net/?f=x%5E2%2B%28-8%29x%3D9)
Explanation:
we have been given with the quadratic equation ![x^2-8x-9](https://tex.z-dn.net/?f=x%5E2-8x-9)
we compare the given quadratic equation with general quadratic equation
general quadratic is ![ax^2+bx+c=0](https://tex.z-dn.net/?f=ax%5E2%2Bbx%2Bc%3D0)
from given quadratic equation a=1,b= -8,c= -9
substituting these values in the formula for discriminant ![D=b^{2}-4ac](https://tex.z-dn.net/?f=D%3Db%5E%7B2%7D-4ac)
![D=(-8)^2-4(1)(-9)=100](https://tex.z-dn.net/?f=D%3D%28-8%29%5E2-4%281%29%28-9%29%3D100)
Now, to find the value of x
Formula is ![x=\frac{-b\pm\sqrt{D}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-b%5Cpm%5Csqrt%7BD%7D%7D%7B2a%7D)
Now, substituting the values we will get
![x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-%28-8%29%5Cpm%5Csqrt%7B100%7D%7D%20%7B2%7D%3D%20%5Cfrac%7B8%5Cpm10%7D%7B2%7D%3D9%2C-1)
And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of
![x^2+bx=c](https://tex.z-dn.net/?f=x%5E2%2Bbx%3Dc)
Answer:
M = 1170 g
Step-by-step explanation:
Mass = density × volume
M = p x v
M = 78 x 15
M = 1170 g
Answer:
15-44+32= 3
Step-by-step explanation:
Answer:
$2,860
Step-by-step explanation:
2,500 * 3.8% = 90 in interest a year
so
90 * 4 = 360 in interest
add that to what she put in
2,860