plzz solve 15 fastly
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answer b)
(2x-7y-10z)²
put formula
x²-y²-z²-2xy-2yz-2xz
2x²-7y²-10z²-2(2×7)-2(7×10)-2(2×10)
4x-49y-10z-28-140-40
(2x-7y-10z)²
put formula
x²-y²-z²-2xy-2yz-2xz
2x²-7y²-10z²-2(2×7)-2(7×10)-2(2×10)
4x-49y-10z-28-140-40
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