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x² - 8x + 5 = 0 => (x² - 8x + 16) - 11 = 0 =>(x - 4)² = 11 =>x - 4 = +- sqrt(11) =>x = 4 +- sqrt(11)

k=3

First step is to choose between the three methods for solving simulataneous equations; elimination, substitution and eqaulity. In this case the best method is probably substitution, but personal preferenc...

f''(x) means that we need to differentiate the function f(x) twice (f'(x) would mean we need to do it once). Differentiation means we multiply the coefficient by the power, and subtract one from the power...

When a number is raised to a power, that means the number is multiplied by itself. The power (the small number) shows how many times we need to multiply the big number by itself. Therefore: 2^3 can be spl...