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Finger [1]
3 years ago
8

1. Use the quadratic formula to solve the equation. -2x^2+3x+5=0

Mathematics
2 answers:
hram777 [196]3 years ago
8 0
The answer is x= 5/2 or -1
artcher [175]3 years ago
4 0
The formula for the solution is:
x=\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

In your case: a=-2, b=3, c=5

Replace these in the formula and you'll get:
x_1=\frac{-b + \sqrt{b^2 - 4ac}}{2a}=\frac{-3 + \sqrt{3^2 - 4 \cdot (-2) \cdot 5}}{2 \cdot (-2)}=-1
x_2=\frac{-b - \sqrt{b^2 - 4ac}}{2a}=\frac{-3 - \sqrt{3^2 - 4 \cdot (-2) \cdot 5}}{2 \cdot (-2)}= \frac{5}{2}

So you have two roots:
x1 = -1
x2 = 5/2
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Naily [24]

Answer:

she didnt go back from 15 she went back from 20and the arrows should be going backwords not forwards

8 0
3 years ago
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Jerry runs up to a tank that holds up to 15 gallons of melted cheese When it is active it drains cheese onto crackers at a const
frosja888 [35]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
Ricky ate 2 soft tacos, and 4 of his friends ate s soft tacos. If there were 18 2 points
shtirl [24]

Answer:

Each friend ate 4 tacos.

Step-by-step explanation:

"4 of his friends ate s tacos" is unclear. I assume it should be

"4 of his friends ate s tacos each."

total tacos = 2 + 4s = 18

4s = 16

s = 4

His four friends ate a total of 16 tacos, each friend eating 4 tacos.

Ricky's reason, i.e., that 6s = 18, is incorrect.

6s = 4s+2s, where 4s is what his friends ate in total.

That implies that Ricky ate 2s tacos, instead of 2 tacos. If 2s = 2 then s = 1, but then 6s ≠ 18.

4 0
3 years ago
4<br> Which of the following is a function?<br> А<br> B<br> C<br> D
Aloiza [94]

Answer:

B)

Step-by-step explanation:

A function is when every input has one output.

Easiest way is to do the "vertical line test" and "horizonal line test."

Basically you draw a vertical line and a horizontal line.

If either line passes through more than one point, then it is not a function.

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7 0
3 years ago
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Someone please help me to solve this questions...​...
wlad13 [49]

Answer:

1) Event A = 2/3

   Event B = 1/2

2) 1/2

Step-by-step explanation:

1)

Event A :

No. we need on dice = 4

Total numbers on dice = 6

Hence sample space of the event = 6

P( getting 4) = 4/6 = 2/3

Event B :

A coin has a head & a tail.

Hence sample space of the event = 2

But as we need tail only ,

P ( getting Tail ) = 1/2   [ if only tossed once ]

2)

Total numbers on a die = 6

Total no. of odd numbers on die = 3 (∵ 1 , 3 & 5 are odd )

Sample space of this event = 6

P (getting an odd number) = 3/6 = 1/2

6 0
4 years ago
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