Question # 1

Factors of x² + y² are:

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(x + iy) (x - iy)

(x + y) (x - y)

(x + y) (x + y)

none

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i

0

π is defined as:

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ration of diameter of a circle to its circumference

ration of the circumference of a circle to its diameter

ration of area of a circle to its circumference

ration of the circumference of a circle to its area

Rational numbers are:

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repeating decimals

terminatingdecimals

periodicdecimals

all of these

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cancellation property w.r.t multiplication

cancellationproperty w.r.t addition

multiplicativeproperty

additiveproperty

The ordered pairs (2, 5) and (5, 2) are:

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not equal

equal

disjoint

empty

Conjugate of a + i b is:

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-a + ib

a + ib

-a - ib

a - ib

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closure property w.r.t multiplication

commutativeproperty w.r.t multiplication

associativeproperty w.r.t multiplication

trichotomy property

If z = x + i y = r (cos Θ + i sin Θ), then arg z is:

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tan Θ

cos²Θ + sin²Θ

r

Θ

The additive inverse of a real number is a:

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0

-a

a

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0

i

-i

1

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rationalnumber

irrationalnumber

naturalnumber

wholenumber

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integer

rationalnumber

irrationalnumber

naturalnumber

The set of negative integers is closed with respect to:

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addition

multiplication

both (a) and (b)

subtraction

The multiplicative invers of a non-zero real number a is:

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0

-a

a

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Reflexive property

Symmetricproperty

Transitiveproperty

Trichotomyproperty

If z₁ = 4i and z₂ = 3 - 9i, then z₁ + z₂ =

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3 - 5i

3i - 5

7 - 9i

3 + 5i

π, e are:

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integers

natural numbers

rationalnumbers

irrationalnumbers

Modulus of 15 i + 20 is:

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20

15

25

none of the above

The real part of the complex number a + bi is:

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b

-b

a

-a

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