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For solving quadratic equation x^(2) + 8...

For solving quadratic equation `x^(2) + 8x = - 15` by completing square method, find the third term.

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Third terms `(("middle term")^(2))/(4 xx "first terms")= ((8x)^(2))/( 4 xx x^(2))= ( 64x^(2))/(4x^(2))= 16`
The required third term is 16.
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