Answer:
Step-by-step explanation:
think of complex numbers as going along the x axis for 5 and along the y axis for 12..... now do you know how to find the magnitude? think Pythagoras
X² − 6x + 7 = 0
Let's complete the square [x²-6x+(??)²] -(??)² +7 = 0
As you noticed we have added the unknown square & also subtract the same so that not to change the equation
The question now is to calculate this square (??)²
We know that the middle term (6x) is twice the square root of the 1st times the square root of the 2nd, That is 6x=2x (multiply) √(??)²
6x = 2x?? & ??=6x/2x===> ?? =3 & (??)² =9
Hence plug (??)² into the equation above:
x² - 6x + 9 - 9 +7 =0
(x²-6x+9) -9 + 7 =0
(x-3)² -2 =0 ====> (x-3)² = 2 (that is B)
39,000/1,300 = 30. 30 x 4 = 120 Hours
The pattern appears to be that each time, the number is multiplied by 10. So the next two numbers should be 60, then 600.
The answer would be A. 3.2 x 106 :)))
