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Expand the following:
(i) \((3a – 7b – c)^2=\)
(ii) \((–2x + 5y – 3z)^2=\)
(iii) \((\frac{1}{4} a-\frac{1}{2}b+1)^2\)
Answer variants:
\(9a^2 + 49b^2 + c^2 – 42ab + 14bc – 6ca\)
\(9a^2 + 49b^2 + c^2 – 21ab + 7bc – 3ca\)
\(4x^2 + 25y^2 + 9z^2 – 20xy + 30yz -12zx\)
\( \frac{1}{16}a^2 + \frac{1}{4}b^2 + 1 + \frac{1}{4}ab – b + \frac{1}{2}a\)
\(\frac{1}{16}a^2 + \frac{1}{4}b^2 + 1 – \frac{1}{4}ab – b + \frac{1}{2}a\)
\(4x^2 + 25y^2 + 9z^2 – 20xy – 30yz + 12zx\)
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