Question

expand using identity
(3x + y -2z)​

Answer 1

Step-by-step explanation:

(3x-y) ^3

(3x)^3 - 3×(3x^2)×(y)+3×(3x)×(y^2) - (b)^3

3x^3- 27x^2y + 9xy^2 -b^3

this the answer

hope it may help you

Answer 2

Correct Question

expand using identity

(3x + y -2z)²

Solution

→ (3x + y - 2z)²

Applying identity :

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

→ (3x)² + (y)² + (-2z)² + 2*3x*y + 2*y*(-2z) + 2*3x*(-2z)

→ 9x² + y² + 4z² + 6xy - 4yz - 12xz

Some Identities

• (a + b)² = a² + b² + 2ab
• (a - b)² = a² + b² - 2ab
• a² - b² = (a + b)(a - b)