PLEASE THIS IS URGENT HELP! Solve for x, 8x - 2(5)= 18
2 answers:
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Answer:
D. 1 real; 4 complex
Step-by-step explanation:
1. Calculate the total number of roots
The fundamental theorem of algebra states that any polynomial of degree n has n roots.
Your polynomial is fifth degree, so it has five roots.
2. Calculate the number of real roots
We can use Descartes' rule of signs to determine the number of real roots:
The number of positive real roots is the same as the number of changes in the sign of the coefficients of ƒ(x) or less than by an even number.
The number of negative real roots is the same as the number of changes in sign of the coefficients of the terms of f(-x) or less than this by an even number.
(a) Number of positive real roots
The coefficients of ƒ(x) are
+1 +3 +8 +14 +16 + 8
There are no changes of sign, so there are no positive real roots.
(b) Number of negative real roots
(i) Find f(-x)
f(-x) = -x⁵+ 3x⁴ - 8x³ + 14x² - 16x + 8
(ii) Count the changes of sign
The coefficients of f(-x) are
-1 ∥ +3 ∥ -8 ∥+14 ∥ -16 ∥ +8
There are five changes of sign.
Thus, the number of negative roots is five, three, or one.
So far, we know that we have five roots. None is positive, and there could be one, three, or five negative real roots.
3. Confirm by sketching the graph
The real roots are the points at which the graph crosses or touches the x-axis.
The graph (see below) crosses the x-axis at only one point.
Thus. we have
- one real root (negative)
- four complex roots
Answer:
Greatest prime is 83 to test 6971 is prime.
Step-by-step explanation:
To find : What is the greatest prime you must consider to test whether 6971 is prime.
Solution :
To determine whether it is prime or not we check it by taking the root and check the nearest prime factor of it
Step 1 - Take the square root of number 6971
Step 2- The last prime number before 83.49
Prime number is 83
Step 3 - Write all the prime number till 83 and if none of the digit divide 6971 then 6971 is prime.
So the only factors to check for 6971 are: 2, 3, 5, 7, 11, 13, 17, 19,, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83.
None of them divides the number
Therefore, 6971 is a prime number.
Greatest prime is 83 to test whether it is prime or not.