Question 4

Which of the following expressions is the conjugate of a complex number with - 6 as the real part and - 5i as the imaginary part?

6 + 5i

6 - 5i

-6 - 5i

-6 + 5i

Question 5

Simplify 81 to the negative 3 fourths power

-27

negative 1 over 27

27

1 over 27

Question 6

Find the solution of three times the square root of the quantity of x plus 5 equals negative 9

x = 4; not extraneous

x = 4; extraneous

x = 0; extraneous

x = 0; not extraneous

Question

Mathematics

Erik Erickson

18 August, 07:38

Question 4

Which of the following expressions is the conjugate of a complex number with - 6 as the real part and - 5i as the imaginary part?

6 + 5i

6 - 5i

-6 - 5i

-6 + 5i

Question 5

Simplify 81 to the negative 3 fourths power

-27

negative 1 over 27

27

1 over 27

Question 6

Find the solution of three times the square root of the quantity of x plus 5 equals negative 9

x = 4; not extraneous

x = 4; extraneous

x = 0; extraneous

x = 0; not extraneous

+1

Answers (1)

Know the Answer?

Lily Howard · Answer 1

The conjugate of a complex number can be determined by arranging first the number into standard form a + bi. The conjugate has a form in which the sign of b is opposite. Hence the answer in 1 is - 6 + 5i. In 2, using a calculator, the answer is 1/27. in 3, extraneous roots are roots in which when substituted to the original function, the function becomes invalid. Answer in 3 is B. x = 4, extraneous.