Gery wants to fence a rectangular field whose area is 1200 sq.m. He has only 100 meters of fencing so he decided to fence only the three side of the rectangle letting the wall be the fourth side. How wide the rectangle should be?

Answer 1

let the length of the single side by y
let each of the other two sides be x

so you have y + 2x = 100 , ----> y = 100-2x

area = xy = x(100-2x)
= -2x^2 + 100x

this is a downwards opening parabola.
Find the vertex, the x of the vertex is the length of one of the two equal sides.

Let me know what you got

Answer 2

I don't even know sir

Answer 3

To be able to do this question, you MUST be studying parabolas.
Have you learned about "completing the square" ?
Do you know that for y = ax^2 + bx + c, the x of the vertex is -b/(2a) ?

Trying to find out where your difficulties lie.

Answer 4

I can't understand that kind of solution sir, please help me to solve this so that I can study this problem. Please sir?

Answer 5

sir?

Answer 6

I have to know what topic you are studying now in math, and at what level or grade . Please answer my two previous questions so I can even begin to help you.