B the answer is b because yiu do like add e square 27 +* 9 + x = 8 -/273/73
Answer:
Step-by-step explanation:
This is a third degree polynomial because we are given three roots to multiply together to get it. Even though we only see "2 + i" the conjugate rule tells us that 2 - i MUST also be a root. Thus, the 3 roots are x = -4, x = 2 + i, x = 2 - i.
Setting those up as factors looks like this (keep in mind that the standard form for the imaginary unit in factor form is ALWAYS "x -"):
If x = -4, then the factor is (x + 4)
If x = 2 + i, then the factor is (x - (2 + i)) which simplifies to (x - 2 - i)
If x = 2 - i, then the factor is (x - (2 - i)) which simplifies to (x - 2 + i)
Now we can FOIL all three of those together, starting with the 2 imaginary factors first (it's just easier that way!):
(x - 2 - i)(x - 2 + i) =
Combining like terms and canceling out the things that cancel out leaves us with:
Remembr that , so we can rewrite that as
and
That's the product of the 2 imaginary factors. Now we need to FOIL in the real factor:
That product is
which simplifies down to
And there you go!
The last two options are correct, but it looks like you’ve got them :)
Answer:
B
Step-by-step explanation: If you put 7 2/5 - 5/8 in a calculator it comes to equal 6.775. Since the answer is asking for an estimate then the answer would be 7.
If the multiplier was 1.54, then you would get more then 1 and a half times your original amount.
Do 100% + 5.4% to get 105.4%.
Turn this into a whole number (divide by 100) to get 1.054 as your multiplier.
1.054