Question

Use the Rational Root Theorem to list all possible rational roots of the polynomial equation x3 - 4x2 + 7x - 8 = 0. Do not find the actual roots.

A. –8, –1, 1, 8

B. –8, –4, –2, –1, 1, 2, 4, 8

C. 1, 2, 4, 8

D. no possible roots

Answer 1

@Forever_Me
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Answer 2

@warsop87

Answer 3

B !

Answer 4

are u sure

Answer 5

Yeah Im Postivie !

Answer 6

okay thnx

Answer 7

but how do u find it!!

Answer 8

yes she is right. For finding the possible rational roots, You have to list all the factors of the last term which is a constant which is 8 in this case and also list all the factors of the leading coefficient ( This is the coefficient of the highest degree) which is x^3 and its coefficient is 1.

the factors of -8 or 1,2,4,8,-1,-2,-4,-8
The factors of 1 is 1,-1

Now divide each factor of 8 by each factor of 1. the + and - signs will take care of itself automatically. at the end you should have a + and - of every number. So do not worry about it now.

So when you divide like that you will end up with answer choice B

Answer 9

thank you all