Find f(x) f(x- 1)=2x? -4x = 2x? - 4x + 2 - 2 = 2(x? - 2x + 1) - 2 = 2(x- 1)x? - 2 == >f(x) = 2x? -2 2014-03-04 23:18: 21supplement: let f(x)=x? 5. If f(k)=k+ 1.
Find the value of k f(k) = k? - 5 = k + 1 == >k? -k-6 = 0 (k-3) (k+2) = 0 k = 3 or k =-2 2014-03-04 23: 30:17 Supplement: If f(x- 1)=2x? -4 times
Find f(x) f(x- 1)=2x? -4x = 2x? - 4x + 2 - 2 = 2(x? - 2x + 1) - 2 = 2(x- 1)? -2 The above figures are incorrect: = 2(x- 1)x? - 2 == >f(x) = 2x? - 2