expand the following ,using suitable identities (-3x+6y-7z)2
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Step-by-step explanation:
Expand :- (-3x + 6y - 7z)²
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as we know that :-
(a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
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where :- a = (-3x) ; b = (6y) ; c = (-7z)
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(-3x + 6y - 7z)²
:- (-3x)² + (6y)² + (-7z)² + 2(-3x)•(6y) + 2(6y)•(-7z) + 2(-7z)•(-3x)
:- 9x² + 36y² + 49z² - 36xy - 84yz + 42xz
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