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3 years ago

Pretty please can someone help

Mathematics

1 answer:

Alenkasestr [34]3 years ago

3 0

Answer:

Step-by-step explanation:

$2x^{2} + x - 4 = 0\\$

divide by 2 throughout

$x^{2} + \frac{x}{2} = \frac{4}{2}$

$x^{2} +2 * \frac{x}{4} +( \frac{1}{4}) ^{2} = 2 + ( \frac{1}{4}) ^{2}\\$

$(x+\frac{1}{4} ^{2} ) = 2 + (\frac{1}{4} )^{2} \\$

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P = (12, 4) and M = (-8, 8)

Elena-2011 [213]

You can look on the app Socratic to help you.

3 0

3 years ago

Can someone tell me the answer for this

lidiya [134]

Right answer number 3, think this gonna help u

5 0

3 years ago

A cargo plane flew from the US across the Atlantic at 212 mph, and flew back to the US at 232 mph. Given that the first trip too

expeople1 [14]

The return trip was 21.2 hours long.

Step-by-step explanation:

Given,

Speed of plane from US = 212 mph

Speed of plane on return trip = 232 mph

Let,

x be the time taken on return trip.

Time taken from US = x+2

We know that;

Distance = Speed * Time

Distance of plane from US = 212(x+2) = 212x+424

Distance on return trip = 232x

As the distance will be same, therefore,

$232x=212x+424\\232x-212x=424\\20x=424$

Dividing both sides by 20

$\frac{20x}{20}=\frac{424}{20}\\x=12.2\ hours$

The return trip was 21.2 hours long.

Keywords: distance, speed

Learn more about speed at:

#LearnwithBrainly

5 0

4 years ago

I have asked so many times and no one will answer. :(

andrew-mc [135]

Answer:

1) $\frac{1}{2^7}$ ; 2) $11^7$

Step-by-step explanation:

1) Using the Power of a Fraction Rule $(\frac{a}{b} )^x = (\frac{a^x}{b^x} )$ ,

$(\frac{1}{2} )^7 = (\frac{1^7}{2^7} )$ , which can just be simplified to $\frac{1}{2^7}$ .

2) Using the Negative Exponent Rule, $a^{-x} = \frac{1}{a^{x}}$ ,

$(\frac{1}{11} )^{-7} = \frac{1}{\frac{1}{11^7}}$ , which can be simplified to $11^7$ .

4 0

3 years ago

How to find the discriminant of

Evgen [1.6K]

the discriminant b^2 - 4ac when the equation is in the form of ax^2 +bx+c=0

13x^2-16x = x^2 -x

we need to get in it the standard form

subtract x^2 from each side

12x^2 -16x = -x

add x to each side

12x^2 -15x = 0

12x^2 -15x -0 =0

a=12 b=-15 c=0

b^2 -4ac

the discriminant = b^2

b^2 = (-15)2 = 225

6 0

3 years ago