2 years ago

Divide the following complex numbers: (5-i)/(4+3i)

Mathematics

1 answer:

skelet666 [1.2K]2 years ago

7 0

Answer:

$\frac{17}{25} -\frac{19}{25} i$

Step-by-step explanation:

$\frac{5-i}{4+3i}$

$= \frac{17}{25} -\frac{19}{25} i$

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otez555 [7]

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3 years ago

Is the square root of 225 a rational number?

MArishka [77]

Step-by-step explanation:

$\text{The principal square root}:\\\\\sqrt{a}=b\iff a^2=b\ \text{for}\ a\geq0\ \text{and}\ b\geq0.\\\\\text{The square root:}\\\\\sqrt{a}=b\iff b^2=a\ \text{for}\ a\geq0\\===================$

$\text{If you want the principal square root (arithmetic square root):}\\\\\sqrt{225}=15\ \text{because}\ 15^2=225\\\\\text{If you want square root (algebraic square root):}\\\\\sqrt{225}=\pm15\ \text{because}\ (-15)^2=225\ \text{and}\ 15^2=225$