How do you simplify #2( - 4z ^ { 2} + 9)#?
1 Answer
Dec 29, 2016
Explanation:
This is an example of what is called the
#color(blue)"distributive law"# That is each of the 2 terms inside the bracket are
#color(red)"multiplied"# by the 2 outside the bracket.
#rArr2(-4z^2+9)=color(red)(2)(-4z^2+9)#
#=color(red)(2)xx(-4z^2)+color(red)(2)xx9#
#=-8z^2+18#
