Maths-
SAT
Easy
Question
If 4x2 +bx +9 = 0, where b is a constant, has exactly one solution, what is a possible value of b ?
- 72
- 36
- 12
- 6
The correct answer is: 12
4x2 + bx + 9 = 0
(2x)2 + bx + 32 = 0
(2x +3)2 = (2x)2 + 2(2x)(3) + 32
Comparing
bx = 2(2x)(3)
b = 12
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