wats (x-3)(x+7)

Question

What does (x-3)(x+7) equal to?

Answer 1

Use the FOIL method

First, Outside, Inside and Last

 

(x-3)(x+7)

 

first..x*x=x^2

outside..x*7=+7x

inside..-3*x=-3x

last..-3*7=-21

 

add like terms +7x+(-3x)=+4x

 

now write complete equation:

 

x^2+4x-21=0

 

Answer 2

Hi Tina you can do it this way....

 

        (X -3)  (X+7)  =

 

 

         (X-3)

         (X+7)       First multiply the two X's  giving X squared    X^2     next

 

                           Multiply the -3 times X   giving -3X     next

                             

                          Multiply the +7 times X    giving 7X    next

 

                        Multiply the numbers  -3  times +7   equals -21   so you have

 

 

                      X^2 +4x -21  Add the X's (-3x +7X)  and multiply the numbers   (+7 times -3)

 

Hope this helps

 

 

Answer 3

You would need to use foil to figure out the distributive property. First Outside Inside Last. You would take the first number in each parentheses in multiply them(so that comes to X^2) then the outside two and multiply(7X), and you would do the other two multiplications and simplify it to get the least amount of terms, which there should be 3 at the end. I didn't give answer but if you still need help just reply back.