square of a number and 21 less than 4 times a number?

Question

this is algebraic expressions please help i suck at math!!!!!!( to diffrent questions)

Answer 1

You have asked too many questions from this homework assignment. You are never going to learn if you keep asking. Maybe you should stay after school and get some help.

Answer 2

let's call the number X
Then this would be
x^2 + 4x - 21, or
(x +7)(x-3)

If this is an equation, and this is = 0, then the answers would be -7 and 3

3^2 + 4(3) - 21 = 9+ 12 - 21 = 0 check
-7^2 + 4(-7) - 21 = 49 -28 - 21 = 0 check

Answer 3

Square of a number:
Let's call this mystery number 'x'. So square the 'x' to get x squared, or x^2.

Twenty-one less than four times a number:
Again, call this number 'x'. Twenty-one less means you are going to subtract 21 from this equation. Four times a number means muliplying 'x' by 4. So you should get:

4x-21

Answer 4

Well the square of a number would be something like the square of 81 is 9. Just use the square root button for whatever the number is.

And for the second one it would be 21< 4n. To solve divide each side by four. So the answer would be 5.25 < n.

Hope this helps!

Answer 5

square of a number---> n^2
21 less than 4 times a number---> 4r-21

Answer 6

I HAVE THE ANSWERS!! =D

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I n <-- its supposed to be the square root sign, here this is the real square root sign --> http://www.asphodel.com/releases/images/73.main.jpg but instead of the example shown in this one it would be "n" as your variable or as you said "a number"

The second one could be looked at two different ways. But since you said expression that means no equal sign therefore there would be no greater then or less then sign so it would be 4n - 21
HOPE THIS HELPED!!

Answer 7

im guesing but 7x3