Question

4. If the side length of a square can be represented by 2x - 5 meters, write an expression that can be used to represent the area of the square. Simplify the expression as much as possible.

5. What is the area of the square when x = 7?​

Answer 1

Ok, so to find the area you would times 2x - 5 like so

(2x -5) (2x - 5)

Then foil out the parenthesis

2x times 2x equals 4x^2
2x times -5 equals -10x
2x times -5 equals -10x
-5 times -5 equals 25

Therefore, your answer after foiling it out is 4x^2 - 20x + 25

Then to find the area when x=7, plug it into the problem.

4(7)^2 - 20(7) + 25

The answer would then be 81