Question

factorise (25m²-40mn+16n²)-49z²​

Answer 1

Answer:

hi friend  the answer is (5m-4n-7z)(5m-4n+7z)

Step-by-step explanation:

(25m²-40mn+16n²)-49z²

(a-b)²=a²-2ab+b²

making 25m²-40mn+16n² in to formula

25m²-40mn+16n²=*(5m)²-2*5m*4n+(4n)²

=(5m-4n)²-49z²

this is in the formula of (a-b)²=(a+b)(a-b)

=(5m-4n)²-(7z)²

=(a+b)(a-b)=(5m-4n-7z)(5m-4n+7z)

friend if u think this answer is best mark it as brainliest

Answer 2

Answer:

(5m) ² - 2(5m )(4n ) + (4n)²

( a²- 2ab + b²= ( a-b)²

(5m - 4n²)