Posted by **George** on Monday, January 12, 2009 at 8:21pm.

CAN SOMEONE PLEASE HELP ME WITH MY SQUARE ROOT AND FOILING PLEASE?

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**Damon**, Monday, January 12, 2009 at 8:32pm
FOIL is just distributive property of multiplication

(a+b)(c+d) = ac + ad + bc + bd

proof with distributive property:

(a+b)(c+d) = a(c+d) + b(c+d)

= ac + ad + bc + bd

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**George**, Monday, January 12, 2009 at 8:39pm
[ãv(2x+2) - ãv(x-3)][ãv(2x+2) - ãv(x-3)] = 4

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**Damon**, Monday, January 12, 2009 at 8:56pm
I do not understand your special symbols but perhaps they are radical signs?

If so then

[ sqrt(2x+2) - sqrt (x-3) ] [sqrt(2x+2) -sqrt (x-3) ] = 4

sqrt (a) sqrt (a) = a

so

(2x+2) - 2 sqrt (2x+2) sqrt(x-3) + (x-3) = 4

or

3 x -2 sqrt (2x+2) sqrt(x-3) = 5

or

(3 x -5)/2 = sqrt (2x^2 -4 x - 6)

square both sides

(9 x^2 -30 x +25)/4 = 2 x^2 -4 x - 6

or

9 x^2 - 30 x + 25 = 8 x^2 - 16 x - 24

or

x^2 -14 x + 49 = 0

(x-7)(x-7) = 0

x = 7

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**Justin Little**, Monday, January 12, 2009 at 9:30pm
Thank you.

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**Anonymous**, Wednesday, January 21, 2009 at 9:45pm
x- -1 when x=3

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