How do you simplify #(x + 9)(x -2)#?

1 Answer
Jan 23, 2017

Answer:

#x^2+7x-18#

Explanation:

Each term in the second bracket must be multiplied by each term in the first bracket. This can be achieved as follows.

#rArr(color(red)(x+9))(x-2)#

#=color(red)(x)(x-2)color(red)(+9)(x-2)#

distribute the brackets.

#=x^2-2x+9x-18#

collect like terms.

#=x^2+(-2+9)x-18#

#=x^2+7x-18#