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4 years ago

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which of the statements about the following quadratic equation is true? 6x2 - 8 = 4x2 7x the discriminant is greater than zero,

so there are two real roots. the discriminant is greater than zero, so there are two complex roots. the discriminant is less than zero, so there are two real roots. the discriminant is less than zero, so there are two complex roots.

2 answers:

lora16 [44]4 years ago

8 0

answer:

A. The discriminant is greater than zero, so there are two real roots.

hope this helps! :o)

d1i1m1o1n [39]4 years ago

5 0

6x^2 - 8 = 4x^2 + 7x
6x^2 - 4x^2 - 7x - 8 = 0
2x^2 - 7x - 8 = 0
discriminant = b^2 - 4ac; where a = 2, b = -7 and c = -8
d = (-7)^2 - 4(2)(-8)
d = 49 + 64
d = 113

the discriminant is greater than zero, so there are two real roots

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Answer:

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The correct option is a

Step-by-step explanation:

From the question we are told that

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=> $\alpha = 0.05$

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$\^ p = 0.5$

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=> $n = [\frac{ 1.96 }{0.05} ]^2 *0.5 (1 - 0.5)$

=> $n = 384$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma }{\sqrt{n} }$

Generally if the level of confidence increases, the critical value of $\frac{\alpha }{2}$ increase and from the equation for margin of error we see the the critical value varies directly with the margin of error , hence the margin of error will increase also

So If the confidence level is increased, then the sample size would need to increase because a higher level of confidence increases the margin of error.

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3 years ago

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3 years ago

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Step-by-step explanation:

Step 1:

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Step 2:

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3 years ago

Solve 4e^2x-3=12 please help

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Step 2:

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Step 3:

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Step 4:

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