3 years ago

. In New York State, 48% of all teenagers own a skateboard and 39% of all teenagers own

Mathematics

1 answer:

Zarrin [17]3 years ago

4 0

Answer:

18.72%

Step-by-step explanation:

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Use the quadratic formula to solve the equation 2x^2+2x-4=0

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Answer:

Step-by-step explanation:

The quadratic formula for the quadratic equation ax² + bx + c = 0:

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

$2x^2+2x-4=0\qquad\text{divide both sides by 2}\\\\x^2+x-2=0$

$a=1,\ b=1,\ c=-2$

Substitute:

$x=\dfrac{-1\pm\sqrt{1^2-4(1)(-2)}}{2(1)}=\dfrac{-1\pm\sqrt{9}}{2}=\dfrac{-1\pm3}{2}\\\\x_1=\dfrac{-1-3}{2}=\dfrac{-4}{2}=-2\\\\x_2=\dfrac{-1+3}{2}=\dfrac{2}{2}=1$

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Step-by-step explanation:

${a}^{3} + 5c$

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3 years ago

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Papessa [141]

Answer:

Step-by-step explanation:

3*2x=6x, 3*5=10

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Add 6 and 4 which leaves you with 10x+10 = 5x+15

subtract 10 from 15 and that leaves you with 5 divided by 10x

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Same for second equation

2*8x=16x and 2*3= 6

So 16x-6=16x+28

Add 6 to both sides so you get 34.

Now that 6 is gone you want x on one side so subtract 16x an it leaves you with 0. so X=34

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Step-by-step explanation:

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