Simplify and then solve by factorisation 3x(x+2)-7=2, to find x.
3x(x+2)-7=2 3x2+6x-7=2 3x2+6x-9=0 3(x2+2x-3)=0 [Divide by 3] (x2+2x-3)=0 (x+3)(x-1)=0 x= -3 x=1
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Related Maths GCSE answers
All answers ▸Solve the simultaneous equations x+y=8 and 3x-y=4.
(a)Show that the lines y=3x+7 and 2y–6x=8 are parallel. [3 marks] (b) Is the point (–5, –6) above, below or on the line y = 3x + 7 ? Do not use a graphical method. [2 marks] [Total 5 marks]
Factorising a Quadratic
ln(2x^2 +9x-5) =1+ ln( x^2+2x-15)