Question

expand (3x+2y) square by using identity​

Answer 1

Answer:

(3x-2y+z)²

= (3x)²+(-2y)²+(z)²+2(3x)(-2y)+2(-2y)(z)+2(3x)(z)

= 9x²+4y²+z²-12xy-4yz+6xz

By using the identity,

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

Answer 2

Answer:

(3x+2y)² = 9x² + 12xy + 4y²

Step-by-step explanation:

(a + b)² = a² + 2ab + b²

:. (3x+2y)² = (3x)² + 2×3x×2y + (2y)²

:. (3x+2y)² = 9x² + 12xy + 4y²

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