f(x)=2x+c, g(x)=cx+5, fg(x)=6x+d; c and d are constants. Work out the value of d
f(g(x))=2(cx+5)+c
fg(x)=2cx+10+c
2cx=6x
2c=6
c=3
10+c=d
d=13
IB
Related Maths GCSE answers
All answers ▸Factorise fully 6x^2-14x
Solve the equations giving your answer in 2d.p (5 Marks).: x^2 + y^2 = 36 , x = 2y + 6
A ladder 7.4m long is leaning against a wall as shown in the diagram. The foot of the ladder is 2.9m away from the wall. Calculate the distance the ladder reaches up the wall to 2 significant figures.
if x^2 + 9x + 20 = 0, what are the possible values of x?