Cristyh Cristyh

19-01-2015
Mathematics

contestada

Factor by completing the square x2-2x-168

Respuesta :

19-01-2015

y=x^2-2x-168
y+168=x^2-2x
y+169=x^2-2x+1
y+169=(x-1)^2
y=(x-1)^2-169

Answer Link

mathdragon mathdragon

19-01-2015

(x+a)^2 = x^2 +2ax+a^2

x^2-2x-168

x^2-2x -168
"complete" the square

x^2 -2x +(1^2) -168 -(1^2)

factor

(x-1)^2 -169

this is a difference of squares
(x-1)^2 -13^2

a^2 -b^2= (a+b)(a-b)

((x-1)+13)((x-1)-13)

=
(x+12)(x-14)

Answer Link

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