3 years ago

What is cos K? I suck at math:(

Mathematics

1 answer:

SVETLANKA909090 [29]3 years ago

6 0

Answer:

cos K = 12/13

Step-by-step explanation:

cos theta = opposite side/ hypotenuse for a right triangle

cos K = 12/13

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IceJOKER [234]

Answer:

a = ±10/9

Step-by-step explanation:

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Hello,

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==========
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<img src="https://tex.z-dn.net/?f=%284%20%2B%206i%29%20%7B%7D%5E%7B2%7D%20" id="TexFormula1" title="(4 + 6i) {}^{2} " alt="(4 +

34kurt

Answer:

$36i^{2}+48i+16$

Step-by-step explanation:

$(4+6i)^{2}$ is essentially $(4+6i)(4+6i)$ (you are squaring $(4+6i)$ , so multiplying it by itself), so to simplify, you would need to distribute.

A good way to go about this is using the F.O.I.L. method, multiplying the First numbers in the parentheses, then the Outers, then Inners, and finally, Lasts.

$(4+6i)(4+6i)$ >> $(4+6i)(4+6i)$ >> $(4+6i)(4+6i)$ >> $(4+6i)(4+6i)$

( $(4*4)+(4*6i)+(6i*4)(6i*6i)$ )

After doing so, you would end up with $16+24i+24i+36i^{2}$ , and after combining like terms, $16+48i+36i^{2}$ .

To write the expression in standard form, though, just order the terms from highest to lowest power!

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Can u add the pic and I’ll answer it

Step-by-step explanation:

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