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First, bring -25 to the other side: +25 which gives x 3 = 128 - x 3 Now, same with - x 3 ( + x 3 for both sides), giving 2x 3 = 128 128 / 2 gives the value of 64 for x 3 In order to find the value for x, now...

So we use the quadratic formula to find out 2 values of x satisfies the quadratic equation we have been given. First we need to write the quadratic formular down, (x=-b.. etc). If you see, we need to plug in...

The main thing to know when answering these sorts of questions is that the denominator of the fraction is the root you take of the given number. For example, 16 1/2 is the same as the sqaure root of 16, whic...

Use substitution u=cos(x) resulting in du=-sin(x)dx: ∫ 0 π/2 sin(x)cos(x)^2dx = ∫ 0 π/2 -u^2du = [-1/3 u^3] x=0 x=π/2 = [-1/3 cos(x)^3] 0 π/2 = (-1/3 cos(π/2)^3) - (-1/3 cos(0)^3) = (-1/3 0^3 ) - (-1/3 1^3) ...

Firstly, you should aim to eliminate one of the unknown values. As b is positive and negative in each equation, this would be a good value to eliminate. Both equations would have to be multiplied to cancel o...