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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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At a country concert, the ratio of number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many
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Answer:

100 boys at the concert

Step-by-step explanation:

When changing the ratio between the number of boys to the number of girls, it always has to be equivalent to the original ratio 2:7

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×50   ×50

To get:

100:350  ⇒  This ratio means that the ratio between the number of boys to the number of girls is now 100:350, but that’s okay to have because it’s still equivalent to the original 2:7 ratio.

So, using the new ratio 100:350, this means that there are 100 boys at the concert and 350 girls at the concert, and 350 is 250 more than 100 which proves what the question is asking. So there are 100 boys at the concert.

<u>Answer:</u> 100 boys at the concert

<em>I hope you understand and that this helps with your question! </em>:)

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3 years ago
Maria and Jason are saving gas money for their trip to Boston. Maria has saved $20 more than double what Jason has. Combined Mar
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Answer:

$60

Step-by-step explanation:

Jason saved gas money (x).  Maria saved $20 more than double what Jason has (20 + 2x).  Combined, they saved $200.  Solve for x for Jason's amount.

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x = 60

Jason saved $60 for this trip.

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4 years ago
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