( w - 6 ) (w + 6 ) = w² - 36
if you find the product of the two ' w ', just add their exponents, that's why i got " w² ".
and by getting the product of the six, just multiply them, that's why i got " 36 ".
and for the sign, it should be negative, because in multiplication, posite times negative equals negative. Positive times positive equals negative.
