Two mark exercise problem X — task. Mathematics State Board, Class 10.

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Answer variants:

$\frac{a - b}{4}$

$-1$

$\frac{a - b}{6}$

$\frac{23}{3}$

$\frac{a + b}{6}$

$\frac{a + b}{4}$

Solve the following quadratic equations by the formula method.

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21. Two mark exercise problem X