Question

Can someone help me super fast? The answers are (m+5n) (m-n) and (a+4b) (a-3b) I just need to know how to get them cuz my calculations aren't working

Answer 1

Let's see

#1

• (m+5n)(m-n)
• m(m-n)+5n(m-n)
• m²-mn+5nm-5n²
• m²+4n-5n²

#2

• (a+4b)(a-3b)
• a(a-3b)+4b(a-3b)
• a²-3ab+4ab-12b²
• a²+ab-12b²