I know it's easy to all you people, but my first question is, is this right:
Difference between ( X) x (X+21) and (X+1) x (X+20)=20
=(x²+x+20x+20)-(x²+21x)
=(x²+21x+20)-(x²+21x)
=(21x+20)-21x
=20
I think it is, that's one point
Point 2
I just can't find an expression which connects...
I know this is a basic question, but can someone please help me with WHEN to use the quadratic formula, i just wondered, can it be used on any quadratic?
thanks, it's just that I'm filling my application form in, and i have chosen maths with mechanics, and physics, as well as chemistry, and Government and Politics, i have done engineering at GCSE level, so i already know some basics
I know this may be a dumb question, but what are the best options to take at a 6th form to go into engineering at Degree level
Maths and Physics are obvious ones, but any others??
chemistry?
TIA
Luke