What is the standard form of y= (x - 40) (x + 4) ?

1 Answer
George C.
Jan 3, 2016

y=x^2-36x-160

Explanation:

If you like, you can use FOIL to help multiply this out:

y = (x-40)(x+4)

= stackrel "First" overbrace(x*x) + stackrel "Outside" overbrace(x*4) + stackrel "Inside" overbrace(-40*x) + stackrel "Last" overbrace(-40*4)

=x^2+4x-40x-160

=x^2-36x-160

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