Question #93719

1 Answer
Alan P.
Apr 6, 2017

#(x+5)(x-3)=color(green)(x^2+2x-15)#

Explanation:

I don't know which "formula" you mean, so I will use:
#color(white)("XXX")(x+color(red)a)(x+color(blue)b)=x^2+(color(red)a+color(blue)b)+color(red)acolor(blue)b#
with #color(red)a=color(red)(+5)# and #color(blue)b=color(blue)(-3)#

#(x+color(red)((+5)))(x+color(blue)((-3)))=x^2+(color(red)((+5))+color(blue)((-3)))x+(color(red)((+5)) * color(blue)((-3)))#

#color(white)("XXXXXXXXXXXXXX")=x^2+2x-15#

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