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sdas [7]
3 years ago
10

How do I factor- EX 4x^2+7x - 15 = 0

Mathematics
1 answer:
Igoryamba3 years ago
8 0

Use the quadratic equation to solve this (bellow will be the image of the quadratic function)  

Remember that quadratic functions are set up like so:

ax^{2} +bx +c = 0

That means that in this equation...

a = 4

b = 7

c = -15

^^^Plug these numbers into the quadratic equation and solve...

\frac{-7+/-\sqrt{(7)^{2}-4(4)(-15)}}{2(4)}

\frac{-7 +/-\sqrt{49+240}}{8}

\frac{-7+/-\sqrt{289}}{8}

\frac{-7+/-17}{8}

Keep in mind that +/- is ±

\frac{-7+17}{8} ---> \frac{5}{4}

\frac{-7-17}{8} ---> -3

Take the opposite of those numbers^^^ like so

(x + 3)(4x - 5)

Hope this helped!

~Just a girl in love with Shawn Mendes

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just olya [345]

Answer:

the quotient of 3 and 4 subtracted from 25.

Step-by-step explanation:

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OH NO!!! Madeleine’s data has been corrupted, again! Using the incomplete data file below, which she was able to recover from he
-Dominant- [34]

Answer:

a. N=25

b. X[bar]= 60.52

c. Y[bar]= 106.72

d. SSx= 115.24

e. ∑X*∑Y = 4036684

f. SSxy= 202020.3296

g. √(SSx*SSy)= 449.46

Step-by-step explanation:

Hello!

Using the attached data you need to calculate some statistics.

a) N

The sample size is listed under the first column "subject" You can see that 25 subjects qhere studied so N=25.

b.

The mean of set X is equal to X[bar]= ∑X/n= 1513/25= 60.52

∑X is listed in the second table.

c.

The mean of ser Y is Y[bar]= ∑Y/n= 2668/25= 106.72

∑Y is listed in the second table.

d.

Sum of Squares of set X SSx= ∑X²-[(∑X)²/n]= 91682-[(1513)²/25]= 115.24

e.

∑X*∑Y =1513*2668= 4036684

f.

SSxy= (∑X²-[(∑X)²/n]) * (∑Y²-[(∑Y)²/n])= (91682-[(1513)²/25]) * (286482*[(2668)²/25])= 202020.3296

g.

√(SSx*SSy)= √(115.24*1753)= 449.46

I hope you have a SUPER day!

3 0
3 years ago
Help plz:
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you will see, this is totally easy. so, once you understand that principle, I am sure you will agree with me that this costs more time putting it in here than just doing it yourself in the future.

you need to consider for addition and subtraction every variable combined with an exponent a different thing, a fruit for example.

you know exactly what to do, when you are being asked to add 3 apples to 2 apples, right ?

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in the first case we simply get 5 (2+3) apples.

in the second case we get 7 (3+4) apples and 4 (2+2) pears.

and nothing else happens here.

we could call x² apples, y² pears, y³ plums, x kiwis, t strawberries, t² raspberries. and the constants could be another fruit or grams of sugar.

now, we simply combine the "fruits" that belong together. there is nothing more to this.

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Step-by-step explanation:

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