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The first priority when answering any question, especially in philosophy and exams with limited time, is to look directly at what the question requires you to do, in the case of the example above, exp...
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 ...
If portion of the unknown were to be placed in a blue Bunsen flame, a green-blue flame would appear. This indicates the presence of copper. If a portion of the unknown were to be added to dilute hydrochlo...
16 = (x-3)(x+3) --> 16 = x^2+3x-3x-9 --> 16 = x^2-9 --> x^2=25 --> x = +5 or -5
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