3 years ago

A way to write numbers by using the digits 0-9 with each digit having a place value

1 answer:

8 0

It 0 maybe this and you can change it when you see it wrong because I'm not seriously with this answer so you can try and work hard to use correct answer thank you

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Step-by-step explanation:

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What are the roots of the quadratic equation 2x2+7x+4=0? Select all that apply.

skad [1K]

Answer:

option A and B

$x=\frac{-7+\sqrt{17}} {4}$

and

$x=\frac{-7-\sqrt{17}} {4}$

Step-by-step explanation:

we have

$2x^2+7x+4=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

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

in this problem we have

$2x^2+7x+4=0$

$a=2\\b=7\\c=4$

substitute in the formula

$x=\frac{-7\pm\sqrt{7^{2}-4(2)(4)}} {2(2)}$

$x=\frac{-7\pm\sqrt{17}} {4}$

$x=\frac{-7+\sqrt{17}} {4}$

and

$x=\frac{-7-\sqrt{17}} {4}$

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Kelly wants to buy 5.6 feet of wood for a bookshelf. The wood costs $3.25 per foot. If Kelly has $18.50 to spend, how much chang

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