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3 years ago

Help meeee please in quadratic equation

Mathematics

2 answers:

Leona [35]3 years ago

8 0

7x² + 31x + 12 = 0

x = -b ± √(b² - 4ac)
2a
x = -(31) ± √((31)² - 4(7)(12))
2(7)
x = -31 ± √(961 - 4(84))
14
x = -31 ± √(961 - 336)
14
x = -31 ± √(625)
14
x = -31 ± 25
14
x = -31 + 25 or x = -31 - 25
14 14
x = -6 or x = -56
14 14
x = ⁻³/₇ or x = -4

Natasha2012 [34]3 years ago

3 0

What part are you wanting to know about? The written of number 9?

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Alex_Xolod [135]

Answer:

Step-by-step explanation:

Given expression is,

(2x - 1)² + 2(2x - 1) = (2x - 1)(2x + 1)

To prove this identity we will take the left hand side of the equation and will prove equal to the right side.

(2x - 1)² + 2(2x - 1) = (2x - 1)(2x + 1)

4x² - 4x + 1 + 4x - 2 = (2x - 1)(2x + 1)

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4 years ago

Solve for x. Leave your answer in simplest radical form.

pochemuha

Answer:

x = 4√7

Step-by-step explanation:

You can use the pythagorean theorem which is a² + b² = c²

if you plug it in, it would be...

x² + 12² = 16²

x² + 144 = 256, subtract 144 to both sides

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6 0

3 years ago

Find M a)21 b)32 c)40 d)63 Step by step please

lina2011 [118]

Answer:

a) 21

Step-by-step explanation:

If the columns are labeled a, b, c, d left to right, it appears that we have ...

$\sqrt{a}\times(b-c)=d\\\\\sqrt{49}\times(10-7)=21$

The value of M is 21.

_____

Questions like this require that you try different combinations of operations on the numbers shown to see if you can find a relationship. Here, the left column is a perfect square, so that is a clue. The difference of the numbers in the middle columns is a factor of the number in the right column -- another clue. It takes a certain amount of creative thought and familiarity with arithmetic facts. There is no "step-by-step" for a problem like this.

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3 years ago

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zzz [600]

Answer:

21 cent per card

Step-by-step explanation:

5.25 / 25 = .21

because 25 can be divided into the first 2 numbers

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3 years ago