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x^2 - 4 consider that in any quadratic the two numbers which end up in the brackets at the end must add up to the middle term in x. they must also multiply ...Read more

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Zn(s) + H2SO4 (aq) –> ZnSO4(aq) + H2(g) Zinc reacts with sulfuric acid to form zinc sulphate and hydrogen gas.

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tanx = sinx/cosx. This identity can easily be shown by asking the student to draw a right-angled triangle, with one of the remaing two angles labelled x.Read more

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First of all, we need to express tangent and cotangent in terms of sine and cosine using the identities: tanx = sinx / cosx and cotx = cosx / sinx.Read more

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The aim of this question is to end up with 'x' standing by itself on one side of the equation. The key principle to achieve this is to understand that whatever ...Read more

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64 2/3 may seem difficult to calculate at first but really boils down to two simple steps. This is because 64 2/3 = (64 1/3 ) 2.Read more

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