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First expand (b-4)(b+5) b²-4b+5b-4*5Simplifyb²+b-20

First multiply the brackets to get: (2x² - 6x + x - 3), Simplify to get: (2x² - 5x - 3), This is then all multiplied by x to get: 2x³- 5x² - 3x.

Firstly, it is important to understand here that "expand" means multiply the two brackets. A logical approach can be taken to this question. Deal with the first term (x^2) of the first bracket: ...

Since the equation has a cubic term, we can expect the curve to have certain properties: it should have three points where the graph touches the x-axis, two turning points, of which one should be a minimu...

Algebra can be tricky to get a hold of but once you've worked through a few questions, you'll quickly get the hang of it!The aim of this question is to find x, that means the solution will look like this:...