Question

pls help from the chapter expansions of class 9 mathematics​

Answer 1

Question :

Factories :-

(2x - 3y + 4z)²

Answer :

→ (2x - 3y + 4z)²

Identity used :- a² + b² + c² + 2ab + 2bc + 2ca

→ (2x)² + (-3y)² + (4z)² + 2×(2x)×(-3y) + 2 × (-3y) × (4z) + 2 × (4z) × (2x)

→4x² + 9y² + 16z² + (-12xy) + (-24yz) + 16zx

Multiplying the symbols ( + ) × ( - ) = -

→4x² + 9y² + 16z² - 12xy - 24yz + 16zx

_______________________....

.°. Answer is 4x² + 9y² + 16z² - 12xy - 24yz + 16zx.