Question

(x - 2y + 5)² - (x - 2y - 5)²​

Answer 1

Step-by-step explanation:

(x - 2y + 5)² - (x - 2y - 5)²

=[x²+(2y)²+5²-2(x)(2y)-2(2y)(5)+ 2(x)(5)]-[x²+(2y)²+(5)²-2(x)(2y)+2(2y)(5)-2(5)(x)]

=[x²+4y²+25-4xy-20y+10x]-[x²+

4y⁴+25-4xy+20y-10x]

=x²+4y²+25-4xy-20y+10x-x²-4y²-

25+4xy-20y+10x

= -40y+20x

is your answer