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This is a quadratic equation, and is likely that x can satisfy either of two values. We know these must multiply to form 20 and summate to -9, and thus they are (x-4) and (x-5). Hence, x is either 4 or 5....

The group 2 elements become more reactive down the group. This is because the atomic radius increases down the group as there are more energy levels. There is also more shielding from inner energy levels ...