Question 669919
{{{2x^2 + 7x + 3 = 0}}}
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{{{2x^2 + 7x  = -3}}}
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{{{x^2 + 7/2x = -3/2}}}
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{{{x^2 + 7/2x + 49/16 = -3/2 + 49/16}}}
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{{{(x+7/4)^2 = 25/16}}}
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{{{sqrt(x+7/4)^2 = +- sqrt(25/16)}}}

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{{{x+7/4 = +-sqrt(25/16)}}}
{{{x = -7/4 +- sqrt(25/16)}}}
{{{x = -7/4 +- 5/4}}}
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{{{-7/4 + 5/4 = -2/4 = -1/2}}}
{{{-7/4 - 5/4 = -12/4 = -3}}}