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Here the key is to remember to differentiate with both x and y with respect to x, where the differential of y is dy/dx. Consider the first term, 3x² : This differentiates to 6x. This is done by...

As 3 ² is equivalent to (-3)² it follows that the square root of 9 must be + or -3.

The first step in answering any maths question is to identify key words or key information. Key information is area, length and width. We have been told that the total area is 56cm2. We know that area is ...

Surds can be simplified if the number in the square root has a square number as a factor. It is also worth remembering that SQRT(ab) = SQRT(a) x SQRT(b). So if you combine these two points, lets look at h...

Rearrange equation 2 to make y the subject, then substitute the y expression into equation 1 and collect like terms: 3x+y=9 -->> y=9-3x x+3y=11 -->> x+3(9-3x)...