f(x)=3x+c g(x)=cx+8 fg(x)=6x+d Work out c and d.
fg(x) means f of g of x
fg(x) = 3(cx+8) + c = 3cx + 24 + c = 6x + d
3cx = 6x 3c=6 c=2
24 + c = d 24+2=d=26
CF
Related Maths GCSE answers
All answers ▸15x^2 − 4x + x^2 + 9x − x − 6x^2 =
Frank, Mary and Seth shared some sweets in the ratio 4:5:7. Seth got 18 more sweets than Frank. Work out the total number of sweets they shared.
How do I find the nth term of a sequence?
Solve these simultaneous equations: 3x-5=-4y and 2xy=-4