Question

use suitable Identity.
(x+2y+4z)²
(x+2) (x-2)​

Answer 1

(x+2y+4z)²

(a+b+c)² = a² + b² + c² + 2ab + 2bc + 2ca

x²+2y²+4z²+2(x)(2y)+2(2y)(4z)+2(4z)(x)

x²+2y²+4z²+4xy+16yz+8zx

(x+2) (x-2)

(x)² - (2)²

x²- 4

keep smiling ❣️