How do you foil # (–9x + 5)(–10x – 6) #?

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Answer 1 · 2015-08-26T15:48:12

#=color(blue)(90x^2+4x-30#

The expression is :#(-9x+5)(-10x-6)#

F O I L involves carrying out the below operations in the following order:

1) product of First terms :#(color(blue)(-9x and -10x))#+

2)product of Outside terms:#(color(blue)(-9x and -6))#+

3)product of Inside terms:#(color(blue)(5 and -10x))#+

4)product of Last terms:#(color(blue)(5 and -6))#

1) #-9x *-10x=color(blue)(90x^2) +#

2) #-9x * -6=color(blue)(54x)+#

3) #5* -10x = color(blue)(-50x)+#

4) #5*-6 = color(blue)(-30#

adding all the terms

#=color(blue)(90x^2+54x-50x-30#
#=color(blue)(90x^2+4x-30#