$\"\"$

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The equation is $\"\"$ .

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Subtract 56a from each side.

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$\"\"$

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$\"\"$

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Rewrite the equation $\"\"$ .

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Group terms with common factors.

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$\"\"$

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Factor the G.C.F from each grouping.

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$\"\"$

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Combine like terms using distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$

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Take square root on each side.

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$\"\"$

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$\"\"$

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Apply addition property of equality: If a = b then a + b = b + a.

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Add 4 to each side.

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$\"\"$

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Apply additive inverse property: $\"\"$ .

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$\"\"$

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$\"\"$

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Divide each side by 7.

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$\"\"$

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$\"\"$

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$\"\"$

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Check:

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To check the solution substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution $\"\"$ is true. $\"\"$

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The values of $\"\"$ .