What is the standard form of #y=(x-1)(x+4) #?
1 Answer
Jan 6, 2016
Explanation:
You can use FOIL to help multiply this out:
#(x-1)(x+4)#
#= stackrel "First" overbrace(x*x) + stackrel "Outside" overbrace(x*4) + stackrel "Inside" overbrace(-1*x) + stackrel "Last" overbrace(-1*4)#
#=x^2+4x-x-4#
#= x^2+3x-4#
