856.
A.
x = -1 or 3
B.
x = 1 or 3
C.
x = 1 or -5
D.
x = -1 or 5
E.
x = -1 or -3
Correct answer is C
1x+1 - 1x+3 = 14
x+3−x−1(x+1)(x+3) = 14
2x2+4x+3 = 14
= x2 + 4x + 3 = 8
x2 + 4x - 5 = 0
= (x - 1)(x + 5) = 0
x = 1 or -5
857.
A.
2√2−√3
B.
3(√6 - 1)
C.
√6 - 3
D.
-12
E.
−√3√2−√2
Correct answer is B
√2√3−√2 - 3−2√3+√2
√2√3−√2 = √2√3 - x√2
√3+√23+√2 = √6 + 2
√3−√2√3+√2 = √3−√2√3+√2 x √3−√2√3−√2
= 5 - 2√6
√6 + 2 - (5 - 2 √6) = √6 + 2 - 5 + 2√6
= 3√6 - 3
= 3(√6 - 1)
858.
In one and a half hours, the minute hand of a clock rotates through an angle of
A.
90o
B.
180o
C.
640o
D.
450o
E.
540o
Correct answer is E
1 hr = 60 mins, 60 mins = 360°
30 mins = 360o1 × 3060
= 180°
90 mins = 360° + 180°
= 540°
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