=m? +4m+4-m? =4m+4
2. Calculation (m-5)? -(m-2)(m+3)= 1
m? - 10m+25-(m? +m-6)
=m? - 10m+25-m? -m+6
=- 1 1m+3 1
3. Calculate 103?
=( 100+3)?
=( 100? )+( 2× 100×3 )+( 3? )
=( 100609 )
4. Calculate (a+b+ 1)(a+b- 1)
=( a+b)? -( 1)?
=(a? +2ab+b? - 1 )
5. Calculation (a-2b)? -(a+2b)?
=(a-2b+a+2b)(a-2b-a-2b)
=2a×(-4b)
=-8ab
6. Calculate (m+n-2)?
=(m+n)? -4(m+n)+4
=m? +2mn+n? -4m-4n+4