3 years ago

Please help!

Mathematics

2 answers:

Snezhnost [94]3 years ago

4 0

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

Use the distributive property to remove the parenthesis:

-9i * -9i = 81i^2

-9i x 4 = -36i

3x8 = 24

3x8i = 24i

Now you have 81i^2 - 36i + 24 + 24i

i^2 = -1

Now you have 81 x -1 - 36i + 24 + 24i

-81 +24 = -57

-36i +24i = -12i

Final answer = -57 - 12i

The answer is D.

Igoryamba3 years ago

3 0

Answer:

Step-by-step explanation:

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1.)12.5+(-31.5)= 2.)-31.91+(-16.7)= 3.)1/6+(-11/12)+2/3= 4.)29+(-15.7)+(-31.05)=

Xelga [282]

1. = Step 1. Simplify Brackets and you get $12.5 - 31.5$ Step 2. Simplify and you get $-19
$ which is your answer.

2. = Step 1. Simplify Brackets and you get $-31.91-16.7$ Step 2. Simplify and you get $-48.61$

3. = Step 1. Simplify Brackets and you get $\frac{1}{6} - \frac{11}{12} + \frac{2}{3}$ Step 2. Simplify and you get $- \frac{1}{12}$

4. Step 1. = Simplify Brackets and you get $29-15.7-31.05$ Step 2. Simplify and you get $-17.75$