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3 years ago

Solve the quadratic equation for x. What is one of the roots?

Mathematics

1 answer:

Anni [7]3 years ago

3 0

Answer:

A) −13

Step-by-step explanation:

(x + 6)^2 = 49

Take the square root of each side

sqrt((x + 6)^2) = ±sqrt(49)

x+6 = ±7

Subtract 6 from each side

x+6-6 = -6 ±7

x =-6 ±7

Separating into 2 parts

x = -6+7 x = -6-7

x = 1 x = -13

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2 years ago

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Step-by-step explanation:

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3 years ago

(11n - 3n) - n<br><br> Help plz desperate

Arlecino [84]

Answer: 7n

Step-by-step explanation:

Because....

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= 11n - 3n - n

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8 0

3 years ago

Read 2 more answers

Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life h

mrs_skeptik [129]

Answer: 3424.28

Step-by-step explanation:

Given data : 378, 361, 350, 375, 200, 391, 375, 368, 321

Number of data values = 9

Mean : $\overline{x}=\dfrac{\sum^n_{i=1} x_i}{n}$

$\\\\=\dfrac{378+361+350+375+200+391+375+368+321}{9}\\\\=\dfrac{3119}{9}\approx346.56$

Variance = $\dfrac{\sum^n_{i=1} (x_i-\overline{x})^2}{n-1}$

$\sum^n_{i=1} (x_i-\overline{x})^2 = (31.44)^2+(14.44)^2+(3.44)^2+(28.44)^2+(-146.56)^2+(44.44)^2+(28.44)^2+(21.44)^2+(-25.56)^2\\\\=27394.2224$

Variance = $\dfrac{27394.2224}{8}=3424.2775\approx3424.28$

4 0

2 years ago