krj275106
Answered

Discover the best answers at Westonci.ca, where experts share their insights and knowledge with you. Join our platform to connect with experts ready to provide precise answers to your questions in different areas. Get immediate and reliable solutions to your questions from a community of experienced professionals on our platform.

Simplify:

x^2-49
-------------
x^2+x-56
The symbol ( ^ ) means that its the little number above the variable. This is a rational expression.
The choices are as follows:
A. x-7
    -----
    x+8

B. x+7
    -------
     x+8

C. x+7
    -------
     x-8

D. x-7
    -------
    x-8

Sagot :

You want to use the reverse FOIL method to break up the equation. (front, outer, inner, last) When you do this, you can simplify the equation down to (x+8)*(x-7). That is equivalent to x^2+8x-7x-56 or x^2+x-56. 
apologiabiology
for x^2-49
this is a diffarence of two perfect squares.  I suggest that this is memorised.
a^2-b^2=(a-b)(a+b)
so x^2-7^2=(x-7)(x+7)

so to solve x^2+x-56 you want to find out what two numbers add to 1 and multiply to make -56
since -56 is negative we know that the two number are difarent signs so that eliminatess answers B and D.
if we try answer C -8+7=-1 so the answer is not C because we want +1 not -1
then we see that 8+(-7)=1 so the answer is A
We appreciate your time. Please come back anytime for the latest information and answers to your questions. Thank you for your visit. We're dedicated to helping you find the information you need, whenever you need it. Westonci.ca is your go-to source for reliable answers. Return soon for more expert insights.