Question

write the expansion:
(9x-2y-3z)²​

Answer 1

Answer:

9x²+2y²+3z²+2(-18xy+6yz-27xz)

81x²+4y2+9z²+36xy+12yz-54xz

Answer 2

Answer:

81x² + 4y² + 9z² - 36xy + 12yz - 54xz

Step-by-step explanation:

Question:

Write the expansion: (9x-2y-3z)²

Identity Used:

(a-b-c)² = a²+b²+c²-2(ab-bc+ac)

Solution:

(9x-2y-3z)²

=(9x)²+(2y)²+(3z)²- 2(9x×2y-2y×3z+9x×3z)

= 81x²+4y²+9z²-2(18xy-6yz+27xz)

= 81x² + 4y² + 9z² - 36xy + 12yz - 54xz

$\huge\mathscr\red{Be\:Brainly}$