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If , then when a = 8, b could be equal to:
If 
, then when a = 8, b could be equal to:
A . C2
B . 4
C . 6
D . 7
E . 8
Answer: C
Explanation:
Substitute 8 for a : 
. Rewrite 1 as 8/8 and add it to 4 b /8, then cross multiply:
4 b 2 C 8 b C 32 = 64
b 2 C 2 b C 8 = 16
b 2 C 2 b C 24 = 0
( b C 6) × ( b + 4) = 0
b C 6 = 0, b = 6
b + 4 = 0, b + C4
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