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Elenna [48]
2 years ago
10

Simplify the expression to a + bi form: (-6 - 9i)(-11 + 7i)

Mathematics
2 answers:
jek_recluse [69]2 years ago
4 0

Answer:

129+57i

Step-by-step explanation:

kumpel [21]2 years ago
3 0

( - 6 - 9i)( - 11 + 7i) \\  = 66 - 42i + 99i - 63 {i}^{2}  \\  = 66 + 57i + 63 \\  = 129 + 57i

I hope I helped you^_^

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Value of (–3/8) × (+8/15). <br><br> A. 11/15<br> B. 11/23<br> C. –1/5<br> D. –1/3
svet-max [94.6K]

ANSWER

The correct answer is C

EXPLANATION

We want to find the value of

- \frac{3}{8}   \times  \frac{8}{15}

This is the same as:

-  \frac{3}{8}  \times  \frac{8}{3 \times 5}

We cancel out the common factors to get:

-  \frac{1}{1}  \times  \frac{1}{1 \times 5}

We simplify to get:

-  \frac{1}{5}

The correct answer is C

5 0
3 years ago
What is the exact value of cos (67.5° )?
Brilliant_brown [7]

Answer:

0.38268343

Step-by-step explanation:

cos( 67.5 )

Rewrite  

67.5

as an angle where the values of the six trigonometric functions are known divided by  2 . cos ( 135\ 2)

Apply the cosine half-angle identity.

±

√

1

+

cos

(

135

)

2

 

Change the  

±

to  

+

because cosine is positive in the first quadrant.

√

1

+

cos

(

135

)

2

Simplify  

√

1

+

cos

(

135

)

2

√

2

−

√

2

2

The result can be shown in multiple forms.

Exact Form:

√

2

−

√

2

2

Decimal Form:

0.38268343

…

6 0
3 years ago
Negative five divided by 5/7
Marrrta [24]

Answer:

-7

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Complete the sentence ​
ryzh [129]

Answer: b, d

Step-by-step explanation:

Corresponding angles are formed when two parallel  straight lines are cut by a transversal

\angle b=62^{\circ}

In the figure, \angle d\ \text{and}\ 62^{\circ} are alternate angle

\therefore \angle d=62^{\circ}

3 0
2 years ago
Given f (x) = -3x + 4, solve for x when f (x) = 1
Solnce55 [7]

Answer:

1

Step-by-step explanation:

8 0
2 years ago
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