Question

1.use the formula to multiply (4m+n)(4m-n)


2.expand(5y-8)2​

Answer 1

Answer:

1.

$1. \: 16{m}^{2} - {n}^{2} \\ 2. \: 25 {y}^{2} - 80y + 64$

Step-by-step explanation:

1.

USING (a+b)(a-b)=a²-b²

then (4m+n)(4m-n)

= (4m)²-(n)²

=16m²-n²

2.

USING (a-b)²=a²-2ab+b²

then (5y-8)²

= (5y)²-2(5y)(8)+8²

25y²-80y+64

Answer 2

Step-by-step explanation:

First use formula (a+b)(a-b)

Ans=(4m)²-(n)²

we have to find square root of 4

4×4=16 it is a square root

=16m²-n²