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= We start by halfing the 10 and putting x + 5 in a bracket = (x + 5)^2 = Opening these brackets give us x^2 + 10x + 25 = To make the 25 the same as - 3 we have to minus 28 = Therefore the answer is = (x ...

dy/dx = 4x - 12
x-coordinate= 5 so sub in
20-12 = 8

First of all there are 3 different methods of working out simultaneous equations: Elimination, Substitution and Graphical. Today I will show the substitution method.
If x + y = 4 then rearranging the...

Explain how the ratio shows everyone's share of the £7200: 1:2:5 (Jay's share:Sheila's Share:Harry's Share)Add up the terms of the ratio to find out many equal parts the £7200 is split into: 1+2+5=8 (part...

(using Pythagoras' theorem) 6.5² = x²+ 1.5² x²= 6.5²- 1.5² x²= 42.25 - 2.25 x² = 40 x = sqrt(40) x ...