I'm feeling really stupid.
What's 3x squared??
Thank you

PS - I'm not really thick - I got 96% in the maths GCSE

Hi Cath,

Your difficulty may be that the question is not clear. Is the expression 3x^{2} or is it (3x)^{2}? The latter expression can be written 3x 3x = 9x^{2}. Thus, for example if x = 5 then