Question

Expand each of the following, using suitable identities:
(ii) (2x+y+z)2
(1) (x+2y + 4z)
(mi) (–2x+3y +22)?
-A--5+1
(v) (-2x + 5y – 3z)?
(iv) (3a – 76-c)?
plz help geniuses.....
any 1 that u know
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Answer 1

First One ........

$(2x + y + z) {}^{2} \\ \\ = \geqslant using \: identity \: \\ \\ = \geqslant (a + b + c) {}^{2} \\ \\ = \geqslant (2x + y + z) {}^{2} = \\ \\ = \geqslant (2x) {}^{2} + (y) {}^{2} + (z) {}^{2} + \\ \\ 2 \times 2x \times y \: + \: 2 \times y \times z + 2 \times z \times 2x \\ \\ = \geqslant 2x {}^{2} + {y}^{2} + {z}^{2} + 4xy + 2yz + 4xz$