How do you find the product of #(9 - 7x)^2 #?

1 Answer
Mar 8, 2018

Answer:

#81-126x+49x^2#

Explanation:

#"note "(9-7x)^2=(9-7x)(9-7x)#

#"each term in the second factor must be multiplied by"#
#"each term in the first factor"#

#rArr(color(red)(9-7x))(9-7x)#

#=color(red)(9)(9-7x)color(red)(-7x)(9-7x)#

#=(color(red)(9)xx9)+(color(red)(9)xx-7x)+(color(red)(-7x)xx9)+(color(red)(-7x)xx-7x)#

#=81color(blue)(-63x)color(blue)(-63x)+49x^2#

#=81-126x+49x^2#