Given:
The given equation is
![2x^3-3x^2+18x-27=0](https://tex.z-dn.net/?f=2x%5E3-3x%5E2%2B18x-27%3D0)
To find:
All the real solutions.
Solution:
We have,
![2x^3-3x^2+18x-27=0](https://tex.z-dn.net/?f=2x%5E3-3x%5E2%2B18x-27%3D0)
It can be written as
![x^2(2x-3)+9(2x-3)=0](https://tex.z-dn.net/?f=x%5E2%282x-3%29%2B9%282x-3%29%3D0)
![(2x-3)(x^2+9)=0](https://tex.z-dn.net/?f=%282x-3%29%28x%5E2%2B9%29%3D0)
Using zero product property, we get
and ![(x^2+9)=0](https://tex.z-dn.net/?f=%28x%5E2%2B9%29%3D0)
and ![x^2=-9](https://tex.z-dn.net/?f=x%5E2%3D-9)
and ![x=\pm\sqrt{-9}](https://tex.z-dn.net/?f=x%3D%5Cpm%5Csqrt%7B-9%7D)
We know that
is an imaginary number because there is a negative sign under the square root.
Therefore,
is the only real solution of the given equation.
Answer:
Step-by-step explanation:
a.) y = 25x + 15
b.) y is the total cost x is the amount of nights stayed 15 is the entrance fee and 25 is the cost per night
i.) x is the amount of nights stayed y is the total cost
ii.) slope (or m) is 25 y-intercept is 15
c.) plug in 3 for x
y = 25(3) + 15
y = 75 + 15
y = 90
its $90 for 3 nights
hope this helps <3
Answer:
B
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
y = -
x + 4 ← is i slope- intercept form
with slope m = - ![\frac{1}{3}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B3%7D)
Parallel lines have equal slopes, thus
y = -
x + c ← is the partial equation
To find c substitute (6, 5) into the partial equation
5 = - 2 + c ⇒ c = 5 + 2 = 7
y = -
x + 7 ← equation of parallel line
Answer:
circle
Step-by-step explanation:
circle