Question

The area of a rectangular room is given by the trinomial x^2 - 3x - 28. What are the possible dimensions of the rectangle? Use Factoring.
A.(x+7) and (x-4)
B.(x-7) and (x-4)
C.(x+7) and (x+4)
D.(x-7) and (x+4)

Answer 1

find the factors of -28 that add to -3.... the larger factor is negative and the smaller is positive

hope it helps

Answer 2

here is what you must do for these problems. First this is much simpler when the x^2 has a 1 multiplied to it which is in your case.

first you must write down a list of two numbers that will multiply to give you -28

second after you have written all of the possible combinations you can think of try to see if two of them will add to -3

then you will have your roots...

but remember the roots are values which will make your equation equal to 0 so if you get -7 for a root for example you will write (x+7) because pluggin in the -7 will give you the zer0.

Answer 3

B.

Answer 4

Sorry i mean D