Factoring and product formulas

Square of sum
$$(a+b)^{2} = a^{2}+2\cdot a\cdot b+b^{2}$$
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Calculate 'a'

Square of difference
$$(a-b)^{2} = a^{2}-2\cdot a\cdot b+b^{2}$$
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      =   
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Difference of squares
$$a^{2}-b^{2} = (a+b)\cdot (a-b)$$
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The cube of sum
$$(a+b)^{3} = a^{3}+3\cdot a^{2}\cdot b+3\cdot a\cdot b^{2}+b^{3}$$
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Cube of difference
$$(a-b)^{3} = a^{3}-3\cdot a^{2}\cdot b+3\cdot a\cdot b^{2}-b^{3}$$
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      =   
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Sum of cubes
$$a^{3}+b^{3} = (a+b)\cdot (a^{2}-a\cdot b+b^{2})$$
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      =   
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Difference of cubes
$$a^{3}-b^{3} = (a-b)\cdot (a^{2}+a\cdot b+b^{2})$$
Find   It is known that:
      =   
Calculate 'a'

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