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Troyanec [42]
3 years ago
8

Evaluate the expression when x=-3 x ^2 + 8x-7

Mathematics
1 answer:
VMariaS [17]3 years ago
3 0

You just have to plug in the -3

(-3)^(2)+8(-3)-7

Then the answer would be -22

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Can some body write a word problem using these numbers
Soloha48 [4]

Answer:

Mr Singh was travelling from England to Punjab, India. He arrived 5 hours after 0:00. When he was on the plane, there was a delay which caused the whole flight to be pushed 4 hours ahead. This would mean that he would arrive 9 hours after 0:00. Mr Singh was also with his son and he had some homework to do. He had to order the numbers   -4,-2\frac{1}{3} ,0, \frac{3}{4} ,\sqrt{5},5  from lowest to highest.

7 0
3 years ago
Someone help because I have no idea
Kisachek [45]

Answer:

A

Step-by-step explanation:

alright so its A because 8 percent is 8 one hundredths which is 0.08, then you have to multiply it by the item, in this case 35, then you will have your answer

3 0
4 years ago
The melting point of nitrogen is -210 °C. The melting point of magnesium is 650 °C.
scoray [572]

Answer:

860 degrees

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7 0
1 year ago
What is the value of b2 - 4ac for the following equation?<br><br> 2x 2 - 2x - 1 = 0
andrey2020 [161]
To figure that out we will need to know the quadratic formula which is: 
x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }

Since we only want to know the square root part we will solve only for this part: 
\sqrt{b^2-4ac}

Now we need to list our values (a,b,c) 
To determine which number belongs to which letter we use the standered form equation which is :
ax^2+bx+c

And next part is super easy! We simply match up the numbers to the letters. We have: 
a=2
b=-2
c=-1 
Next we plug in the given info into the square root:
<span>\sqrt{(-2)^2-4(2)(-1)}
</span>Now we solve: 
<span>\sqrt{(4-4(2)(-1)}
</span><span>\sqrt{(4-8(-1)}
</span><span>\sqrt{(4-(-8)}
</span><span>\sqrt{(12)}
</span><span>\sqrt{(12)}
</span><span>\sqrt{(12)}=3.46
Final answer: 3.46
</span>
8 0
4 years ago
Read 2 more answers
If a car with an average speed of 50 miles per hour drives for 90 minutes, how far will it have gone?
gayaneshka [121]
90 minutes = 1,5 hours 
Distance = speed * time = 50 * 1.5 = 75 miles (answer).
5 0
3 years ago
Read 2 more answers
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