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__The problem__**Factorize**: [itex] a^{2}-\left ( b+c \right )^{2}[/itex]

expanded it to see if I can find any solution:

[itex] \left ( b+c \right )^{2}=b^{2}+2bc+c^{2}[/itex]

[itex] a^{2}-\left ( b^{2}+2bc+c^{2} \right ) [/itex]

[itex] a^{2}- b^{2}-2bc-c^{2} \right )[/itex]

But I can’t get any further.

What should I do now to simplify it? Please explain and show me a couple of clues or something?