expand (i) (2x-5y-7z)²
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Answer:
MARK BRAINLIEST PLEASSSSS
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Soln:-
(2x-5y-7z)² = 4x²+25y²+49z²
-20xy +70yz-28xz
Formula :-
(a-b-c)² = a²+b²+c²-2ab+2bc-2ac
Expantion:-
(2x-5y-7z)² = (2x)²+(5y)²+(7z)²
-2(2x)(5y)+2(5y)(7z)-2(2x)(7z)
= 4x²+25y²+49z²
-20xy +70yz-28xz
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