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3 years ago

What is the solution?

Mathematics

1 answer:

AfilCa [17]3 years ago

4 0

Answer:

Step-by-step explanation:

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Solve using the quadratic formula 2x^2+8x-5=0

Ede4ka [16]

Step-by-step explanation:

Hey there!!

Given,

${x}^{2} + 8x - 5 = 0$

Comparing it with ax^2+bx+c =0 we get,

a= 1, b= 8, c= -5.

Using formula,

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

Keep all values,

$x = \frac{ - 8 + - \sqrt{ {8}^{2} - 4 \times 1 \times ( - 5)} }{2 \times 1}$

$x = \frac{ - 8 + - \sqrt{64 + 20} }{2}$

$x = \frac{ - 8 + - \sqrt{84} }{2}$

$x = \frac{ - 8 + - 2 \sqrt{21} }{2}$

Taking negative,

$x = \frac{ - 8 - 2 \sqrt{21} }{2}$

$x = \frac{ - 2(4 + \sqrt{21}) }{2}$

$x = 4 + \sqrt{21}$

Similarly, taking positive,

$x = \frac{ - 8 + 2 \sqrt{21} }{2}$

$x = \frac{ - 2(4 - \sqrt{21} ) }{2}$

$x = 4 - \sqrt{21}$

Therefore, x= (4 + root 21, 4 - root 21).

Hope it helps.....

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3 years ago

A craftsman can bulid 7 birdhouses in 5 hours

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Answer:

whats the question?

Step-by-step explanation:

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3 years ago

Help me pls i'm on a timer!!!!

e-lub [12.9K]

Answer:

C, 360

Step-by-step explanation:

Interior angle sums can be found using the equation (N=-2)*180, where N equals the number of sides of the polygon.

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3 years ago

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Answer please I need help

damaskus [11]

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E. C. D

Step-by-step explanation:

Thoae are the corrwct ones, hope ir helpa :)

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3 years ago

The sweater shack is offering a 20% discount on sweaters. IF the regular price of a sweater is $15.00 what is the discount? What

andriy [413]

Discount 15 times .20= $3 discount

Sale price = $12. 15-3=12

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4 years ago