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-Dominant- [34]
2 years ago
8

Nathaniel is using the quadratic formula to solve 0 = x2 + 5x - 6. His steps are shown below.

Mathematics
2 answers:
Irina-Kira [14]2 years ago
5 0
Hello,

x²+5x-6=0
Δ=5²+4*6=49=7²
x=(-5+7)/2 or x=(-5-7)2
==>x=1 or  x=-6

Answer B
lakkis [162]2 years ago
4 0

Answer:

The correct option is 2. The solutions of the equation are -6 and 1.

Step-by-step explanation:

The given equation is

x^2+5x-6=0

The quadratic formula:

x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}

x=\frac{-5\pm \sqrt{5^2-4(1)(-6)}}{2(1)}

x=\frac{-5\pm \sqrt{49}}{2}

x=\frac{-5\pm 7}{2}

The solution of the equations are

x=\frac{-5+7}{2}=1

x=\frac{-5-7}{2}=-6

Therefore the correct option is 2. The solutions of the equation are -6 and 1.

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Answer:

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Step-by-step explanation:

In this case we have 3 trials and we have 2 options for each one. The driver has or hasn't been under alcohol influence. The probability that the driver has is 0.29 and the probabiility that the driver hasn't is 1 - 0.29 = 0.71

each trial is independent because we are assuming that the population of drivers in between 21 and 25 years old is very big.

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