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When a question asks for rate of change, this means you need to differentiate the equation. First you need to put the equation into differentiable a form ie, with the no variables on the denominator: f(t)...

5-2x-x²=0x²+2x-5=0 (moving everything over to the other side)then using the quadratic formula (to use a whiteboard during interview)a=1, b=2, c=-5x=(-2 +/- √(2^2 - 4x1x-5))/(2x1)x=(-...

The way to go about a question like this is to break it down into steps; rather than trying to multiply all the brackets at once expand two first then multiply by the third. ------------------------------...

Group the like terms together to make the equation less messy leaving the equation equal to 0.Simplify the long quadratic equation into brackets.Each bracket must be equal to 0 to fulfil the equation.When...

steps as follows:x times x = x²2 times 5 = 102 times x = 2xx times 5 = 5xthen add these together:y = x² + 7x +10x = -2, -5; y = 0, 10