Two mark example problems I — task. Mathematics State Board, Class 9.

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Answer variants:

{4 a}^{2} + 12 ab - {9 b}^{2}

{4 a}^{2} - 12 ab + {9 b}^{2}

{9 x}^{2} + 24 xy + {4 y}^{2}

a^{2} + b^{2} + c^{2} + 2 ab + 2 bc + 2 ca

m^{2} + 3 m - 40

{9 x}^{2} + 24 xy + {16 y}^{2}

a^{2} + b^{2} + c^{2} - 2 ab - 2 bc + 2 ca

m^{2} - 3 m - 40

{25 x}^{2} - {16 y}^{2}

{25 x}^{2} + {16 y}^{2}

1. Expand the following using identities:

2. Expand \((a - b + c)^2\).

Answer:

\((a - b + c)^2 =\)

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2. Two mark example problems I