Find the side length s of the square. when your answering, explain too. like probably the formula

21

Step-by-step explanation:

A = s^2

You need to find the square root of the area which is the square root of 441.

What number do you multiply by itself and get 441?

Try 15: 15^2 = 15 * 15 = 225     too low

Try 18: 18^2 = 18 * 18 = 324    still too low

Try 20: 20^2 = 20 * 20 = 400    still low but getting closer

Try 21: 21^2 = 21 * 21 = 441   this is it

s = 21 cm

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