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Grouping is essentially factorisation, it's just the idea that ax + bx = (a+b)x, which we already know. But the difficulty is in recognising this relationship when x is more complicated, for example when ...

(3x-6)(2x-1)

Multiply out the brackets:

3a+12=ac+5f

3a-ac=5f-12

a(3-c)=5f-12

a=5f-12/3-c

Firstly, look at the given area of the rectangle. As this is 20cm², the length and width of the rectangle could be a combination of 20 and 1; 10 and 2 or 5 and 4. Any of thse options could be u...

If the cross section is 30cm², then we need to multiply the cross section by the length of the prism therefore, it should be 30x25, which is 750cm²