hi. can u help to show the working with correct answer

SMO15 SULIT SMO15 SULIT SECTION B 14 Let S denote the set of all values of a for which 4' + (20 +1)2' + a(a +1) - 0has two real values of x, then S equals This section consists of 20 questions. Each question has four answer options. Answer all (a) (-00, -1) questions. Choose the best answer. ( b ) ( - 20 , 0 ) ( c ) (0.0) 11 (d) (-1, 00) (a) 0 (b) 1 2 15 If x is an integer satisfying x' -6.x + 5 50 and x' -2x > 0 then the number of (c) 1 possible values of x is (d) (a) 2 (b) 3 (c ) 12 If log,, 3= c and log,, 5= d, then the value of log,, 8 is (d) infinite (8) 2(1-c-d) ( 6 ) 3 ( 1 + c+ d ) 16 The solution set of - -3x-4 >lis x-7 ) 3 (1 +c-d) (a) (2-V15, 2+V15) 0(7, 00 ) (d) 3( 1 -c-d) (b) (-1,4) 0(7, 20 ) (C) (1,3) 0 (7, 00 ) (d) none of these 13 If x, a, bare real numbers and 1-M =a-bi, then a + b' is I+ x (a) (b) 2 (c) 2(1-x7) (d) 2(1+x)