Question

The area of a rectangle is given by A = x2 – 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units.

Answer 1

It would be x=5

Answer 2

so if you know that A=45 so than just make this equation equal with 45 and check it how what will get

OK ?

Answer 3

so

x^2 -2x +30=45

Answer 4

subtract from both sides 45 and will get

x^2 -2x +30-45=45-45

x^2 -2x -15=0

(x-5)(x+3)=0

x-5=0
x=5 so just this value will be right because for x+3=0 you will get x=-3 but you know sure that a length of a side not can be negative never ...

good luck

hope so much that is understandably sure right

bye