Answered

How to multiply? (x-4)(x+5)

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Mikeylaaaviz
Using the foil method. x(x)+ (-4x+5x)+(-4)(5)
You will get the answer x²+x-20 :) 
Dominiviz
FOIL Method is the best method to find the answer were F=x^2,O=5x,I=-4x,L=-20  Combine like terms so the answer is x^2+1x-20