D, while numbers is the answer
Answer:
Step-by-step explanation:
I think 3
An example of the difference of squares would be: a^2-b^2 = (a+b)(a-b)
Answer:
She didn't put the sign's in the proper place, it should be ( x + 3 ) ( x - 7 )
Step-by-step explanation:
( x - 3 ) ( x + 7 ) = x² + 7x - 3x - 21 = x² + 4x - 21
( x + 3 ) ( x - 7 ) = x² - 7x + 3x - 21 = x² - 4x - 21
