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How do you multiply #(7x-y)(8x+9y)#?

1 Answer

Dec 4, 2015

#=color(blue)(56x^2 + 55xy -9y^2#

Explanation:

#(color(blue)(7x)-color(purple)(y))(8x+9y)#

#= color(blue)((7x) * (8x) + (7x) * (9y) )+ color(purple)( (-y) * (8x) + (-y) * (9y)#

#=56x^2 + 63xy -8xy -9y^2#

#=color(blue)(56x^2 + 55xy -9y^2#

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