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3 years ago

Indicated operation and write the result in the form a+bi -9(-9i+4)+3(8+8i)

Mathematics

2 answers:

Kaylis [27]3 years ago

3 0

Answer:

-12 + 105i

Step-by-step explanation:

-9(-9i+4)+3(8+8i)

Distribute

81i -36 +24 +24i

Combine like terms

-36 +24 + 81i +24i

-12 + 105i

Blababa [14]3 years ago

3 0

Answer:

-12 + 105i

Step-by-step explanation:

-9(-9i+4)+3(8+8i)

81i - 36 + 24 + 24i

-12 + 105i

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3 years ago

Work out the angle of elevation from the

insens350 [35]

$\quad \huge \quad \quad \boxed{ \tt \:Answer }$

$\qquad \tt \rightarrow \:Angle \:\: of \:\: elevation= 30°$

____________________________________

$\large \tt Solution \: :$

Let the angle of elevation be " x "

$\qquad \tt \rightarrow \: \cos(x) = \dfrac{9 \sqrt{3} }{18}$

$\qquad \tt \rightarrow \: \cos(x) = \dfrac{ \sqrt{3} }{2}$

$\qquad \tt \rightarrow \: x = \cos {}^{ - 1} \bigg( \cfrac{ \sqrt{3} }{2} \bigg )$

$\qquad \tt \rightarrow \: x = 30 \degree \: \: or \: \: \cfrac{ \pi}{6} \: \: rad$

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