Question

Simplify:
(-2i) (8i)

Answer 1

When multipling i's together, they fall out so your answer is 16

Answer 2

Oh! that makes sense, thank you cx

Answer 3

Take note that \[i=\sqrt{-1}\]
Therefore by using distribution, you get \[-16i^2=-16(\sqrt{-1})^2=-16(-1)=16\]

Answer 4

True or false:

Any number in the form of a+b, where a and b are real numbers and b=0 is considered a pure imaginary number.

Answer 5

Also what @Hoslos said.

Answer 6

Ohhh

Answer 7

False

Answer 8

Real number is that without the i constant, whereas an imaginary number has i constant.
Therefore if a and b are real, there is no way it is an imaginary number. False.

Answer 9

Thank you so much guys! Can you help with some more?? I have a deadline in like two hours and have 20 things to do Dx

Answer 10

Sure!

Answer 11

I've got all day!

Answer 12

Sweet, thank you ^^

The minimum value or a function is the smallest y-value of the function

True or false

Answer 13

I think true

Answer 14

True. It is the peak of the parabola of the function that is u-shaped.

Answer 15

Alright,

And one more true or false:
Complex numbers can be graphed on the real xy coordinate plane

Answer 16

False

Answer 17

False.
X-axis is for Real Numbers and y-axis for imaginary numbers.

Answer 18

Suppose a parabola has an axis of symmetry at x=-1, a maximum height of 6, and passes through a the point (-2,1). Write the equation of the parabola in vertex form

A. y=-0.56(x-1)^2+6
B. y=-5(x+1)^2+6
y+-2.5(x-1)^2+6
C. y=-2(x+6)^2-1

Answer 19

Not sure but i'm thinking b...

Answer 20

Same here

Answer 21

Use the formula\[y=a(x-p)^2+q\]
Where q is y-vertex and p a x-vertex.
A point is to be replaced at y and x being left with a, which is hat we have to find first.
So, making substitutions, we get\[1=a[-2-(-1)]^2+6\rightarrow1=a+6\rightarrow a=1-6=-5=a\]
Lastly, we rewrite the same formula, without replacing x and y as the points. That is \[y=-5(x+1)^2+6\]

Answer 22

B shall be the answer.

Answer 23

Thank you so much!!

Vertex form of this equation:

y=-x^2+12x-4??


and expression in factored form

2x^2+16x+24

Answer 24

First one: The vertex is (-6,-40)
Second one: 2(x+6)(x+2)

Answer 25

And the question is...?

Answer 26

Thank you so much everyone!!

Answer 27

No problem @Squeeks1713 .