Question

Factorise: x^2/16-2xy +16y^2​

Answer 1

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x² + 16y² + 64z² - 8xy - 64yz + 16zx

Using

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

Keeping x = a , -4y = b , 8z = c

We get , ( x - 4y + 8z )²

Hence, the answer is

( x - 4y + 8z )²

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