The complex number -5i has the complex trigonometric form of 5(cos 270o + isin 270o) Determine if the statement given is true or false.

TRUE

Step-by-step explanation:

A complex number is represented as z = x + iy

Given the complex number -5i, this can also be written as;

z = 0-5i

Get the modulus

|z| = √0²+(-5)²

|z| = √25

|z| = 5

Get the argument

theta = arctan(y/x)

theta = arctan(-5/0)

theta = arctan(-∞)

theta = -90degrees

Since tan is negative in the 2nd and fourth quadrant

in the fourth quadrant, theta - 360 - 90

theta = 270 degrees

Express in polar form;

z = |z|(cos theta + i sintheta)

z = 5(cos270°+ison270°)

Hence the statement given is TRUE

truue

Step-by-step explanation:

just did the quiz on edg

x+14

step-by-step explanation:

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1