Question

u none of these 25. IF log2 (22–5x+8) = 1, then x is (a) {2,3) (b) {4,5) (c) (5,1) (d) None of these

JEE/Engineering Exams

Maths

Solution

133

4.0 (1 ratings)

( log _{2}left(x^{2}-5 x+8right)=1 ) ( x^{2}-5 x+8=2 ) ( x^{2}-5 n+6=0 ) ( x^{2}-3 x-2 n+6=0 ) ( 4(x-3)-2(4-3)=0 ) ( (x-2)(x-3)=0 ) ( (x-8)>(x=-3) )