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Input:
solve(x^2+4x+a)
Write:
`solve(x^2+4x+a)`
Compute:
$$solve(a+4\ x+{x}^{2})$$
Output:
$$solve(a+4\ x+{x}^{2})== -2+\frac{1}{2}\ (\sqrt{16-4\ a})\ and\ -2-\frac{1}{2}\ (\sqrt{16-4\ a})$$
Result: $$-2+\frac{1}{2}\ (\sqrt{16-4\ a})\ and\ -2-\frac{1}{2}\ (\sqrt{16-4\ a})$$
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