if f(x) = 7x-1 and g(x) = 4/(x-2), solve fg(x) = x
fg(x) = 7(4/x-2) -1 = x
28/(x-2) - 1 = x
28/(x-2) = x +1
28 = (x+1)(x-2)
28 = x2 - x - 2
0 = x2 - x - 30
0 = (x-6)(x+5) x=6 x=-5
SW
Related Maths A Level answers
All answers ▸Find d/dx (ln(2x^3+x+8))
y = arcsec(x), Find dy/dx.
There's a school in India where only 60% of students have internet access. What is the probability of choosing eight students randomly, five of whom have internet access? (Info: Each student's internet access (or lack of it) is independent from all others
Make x the subject of the equation: 5x+1 = 2-4x