3 years ago

Factor the polynomial x²+8x+15

Mathematics

2 answers:

SashulF [63]3 years ago

8 0

Answer:

( x + 3 ) ( x + 5 )

Step-by-step explanation:

Hope this helps !

Nimfa-mama [501]3 years ago

6 0

Answer:

x²+8x+15

doing middle term factorization

x²+5x+3x+15

x(x+5)+3(x+5)

(x+5)(x+2) is your answer

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$z=\frac{0.40 -0.45}{\sqrt{\frac{0.45(1-0.45)}{370}}}=-1.933$

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Information given

n=370 represent the sample selected

$\hat p=0.4$ estimated proportion of readers owned a laptop

$p_o=0.45$ is the value that we want to test

z would represent the statistic

$p_v$ represent the p value

Creating the hypothesis

We need to conduct a hypothesis in order to test if the true proportion of readers owned a laptop is different from 0.45, the system of hypothesis are:

Null hypothesis: $p=0.45$

Alternative hypothesis: $p \neq 0.45$

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$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

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