+0

# Math Questions(Multiple choice)

0
724
1

Select the pair of consecutive integers between which a real zero of f(x) = x3 + 5x2 –x – 6 exists.

A)-6, -5

B)-2, -1

C)2, 3

D)-4, -3

Write the polar form of the complex number 3-2i, using θ such that 0 ≤ θ ≤ 360º. Round numerical values to the nearest hundredth.

A)3.61(cos 326.31º - i sin 326.31º)

B)326.31(cos 0.61º + i sin 3.61º)

C) 326.31(cos 326.31º - i sin 326.31º)

D) 3.61(cos 326.31º + i sin 326.31º)

The function f(x) = 8x4 – 72x3 +144x2 has ____ possible zeros.

A) none

B) four

C) one

D) three

Guest Nov 4, 2014

#1
+26640
+5

First question.  These graphs might help:

In general, insert the two values into the function.  If the results are of opposite sign there is a zero between them.

Second question

Third question.

Because this is a 4th order polynomial there are 4 roots.  However, in this case two of them are the same (there are two roots with x = 0).  The other roots are at x = 3 and x = 6.

.

Alan  Nov 5, 2014
Sort:

#1
+26640
+5

First question.  These graphs might help:

In general, insert the two values into the function.  If the results are of opposite sign there is a zero between them.

Second question

Third question.

Because this is a 4th order polynomial there are 4 roots.  However, in this case two of them are the same (there are two roots with x = 0).  The other roots are at x = 3 and x = 6.

.

Alan  Nov 5, 2014

### 9 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details