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

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. 

P(At least one sum of 8) = 1 - P(No sums of 8)
 
P(At least one sum of 8) = 1 - (1 - 5/36)^2

P(At least one sum of 8) = 1 - (31/36)^2

P(At least one sum of 8) = 1 - 961/1296
 
P(At least one sum of 8) = 335/1296
 
So the answer is choice B

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