Question

Expand (2x+y-4z)^2 Fast

Answer 1

Answer:

Step-by-step explanation:

Hi friend

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Your answer

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EXPANSION

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using identity => (a + b + c)² = a² + b² + c² + 2(ab + b c + ca)

(2 x +  3 y- 4 z)²

=> (2 x)² + (3 y)² + ( -  4 x )² + 2[ (2 x).(3 y) + (3 y).(- 4 z) + (- 4 z).(2 x)]

=> 4 x² + 9 y² + 16 z² + 2(6 x y - 12 y z - 8 z x)

=> 4 x² + 9 y² + 16 z² + 12 x y - 24 y z - 16 z x

HOPE IT HELPS.

Answer 2

Answer:

I am not sure but I think so 91 is answer