Question

please answer (m+n)² -(m-n)²​

Answer 1

Answer:

0 is answer

Step-by-step explanation:

( m + n )² - ( m - n )²

m² + n² - 2mn - m² - n² + 2mn

0

Answer 2

(m+n)²-(m-n)²

(m+n)² is in the form of (a+b)² and (m-n)² is in the form of (a-b)²

(a+b)²=a²+2ab+b²; (a-b)²=a²-2ab+b²

so we write (m+n)²and (m-n)² in the form

of (a+b)² and (a-b)²

= (m²+2mn+n²)-(m²-2mn+n²)

we know that - × + = - and - × - = +

=m²+2mn+n²-m²+2mn-n²

=2mn+2mn (here m²and -m² cancelled and

+n² and -n² are also cancelled)

=4mn