Answer:
x^2 + y^2 -2x -8y -47 =0
Step-by-step explanation:
The center is at (1,4) and the radius is 8 units
We can write the equation as
(x-h)^2 + (y-k)^2 = r^2
where (h,k) is the center and r is the radius
(x-1)^2 + (y-4)^2 = 8^2
Foil
x^2 -2x+1 + y^2 -8y +16 = 64
x^2 + y^2 -2x -8y +17 =64
Subtract 64 from each side
x^2 + y^2 -2x -8y +17-64 =64-64
x^2 + y^2 -2x -8y -47 =0
Answer:
The voltage is 10 + 2j volts.
Step-by-step explanation:
Ohm's first law:
By Ohm's first law, the voltage is the multiplication of the current by the resistance, that is:
The voltage is measured in Volts, the current in amps and the resistance in ohms.
In this question:
Both the current and the resistance have complex parts. We have to know that:
We have that:
Then
The voltage is 10 + 2j volts.
To find the significant figure you must start from the left.
If you see a 0 then you mustn’t count it and look at the next number.
In this case we have a 9 as the first digit on the left.
We are rounding to 1 significant figure so our answer would be 100000.
Hope this helped!
No its a common factor of 36 but not 56