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Morgarella [4.7K]
2 years ago
7

Given f(x)= 2x^3+kx-1, and x+1 is a factor of f(x), then what is the value of k?

Mathematics
2 answers:
VMariaS [17]2 years ago
5 0

Answer:

put x=-1, and the rest will be easy

4vir4ik [10]2 years ago
5 0

If x + 1 divides f(x), this means x = -1 is a root of f(x), i.e. f(-1) = 0. Plugging in x = -1 gives

f(-1) = 2 (-1)³ + k (-1) - 1 = -3 - k = 0

Solve for k; you end up with k = -3.

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This statement is justified by which property of equality?
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Answer:

symmetric property

Step-by-step explanation:

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3 years ago
What is the product of 2x + y and 5x – y + 3?
Radda [10]

Answer:

The product of 2x + y and 5x – y + 3 is 10x^2+ 3xy + 6x - y^2 + 3y

Step-by-step explanation:

The product of the two expressions can be expressed mathematically as;

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To obtain the product of these expressions, we simply expand the brackets as follows;

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3 years ago
Read 2 more answers
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Sindrei [870]

Answer:

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Step-by-step explanation:

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I switch the way the sign was facing bc I divided by a negative.

Now I know that this must be wrong, but it makes the most sense because I am pretty sure I did all of the math right. Sorry this probably didnt help , but I did a lot of work to try and get the right answer, so Im not putting that work to waste

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2 years ago
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