How do I do these questions?

Mathematics

1 answer:

yan [13]4 years ago

4 0

Step-by-step explanation:

The imaginary part of the number is where i is being multiplied by a constant. The real part is where there is no i present. I'll do a few examples.

26. The real part is 0, since there are no terms that don't have i. The imaginary part is 8i, since i is being multiplied by 8.

27. The real part is 7, since there is no i. The imaginary part is 3i, since i is being multiplied by 3.

31. The real part is 52, since there is no i. The imaginary part is 0i, since i is being multiplied by 0. You don't see the i because zero times i is zero.

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Simply by using rationalize denominators. 2a^-1/2

Advocard [28]

Pemdas, so exponent before multiply
so do a^-1/2 then multiply it by 2

remember that $x^ \frac{m}{n}= \sqrt[n]{x^m}$ and
$x^{-m}= \frac{1}{x^m}$
therefor, $a^ \frac{-1}{2}= \frac{1}{a^ \frac{1}{2} } = \frac{1}{ \sqrt{a} }$
the we multiply by 2

$\frac{2}{ \sqrt{a} }$

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