Wondering if these answers are correct!

H

HB09

New member
Joined
Jul 6, 2017
Messages
31
Hello! What a great forum to come across! I take all online classes and dont usually have people to communicate with. My new class does not have a book and this week doesnt give many examples. I was wondering if anyone could tell me if I answered these questions correctly or if I am missing anything? Im kind of at a stand still! Thank you
[FONT=&quot]
Quadratic Formula
-x^2+8x=9 answer x=4+√7

Linear Equation
25x +50,000=80,000 answer 1200
[/FONT]
[FONT=&quot] algebraic expressions
4x-3 x=2 answer is 5[/FONT]
 
HB09 said:
Hello! What a great forum to come across! I take all online classes and dont usually have people to communicate with. My new class does not have a book and this week doesnt give many examples. I was wondering if anyone could tell me if I answered these questions correctly or if I am missing anything? Im kind of at a stand still! Thank you

Quadratic Formula
-x^2+8x=9 answer x=4+√7 ...... Incomplete

Linear Equation
25x +50,000=80,000 answer 1200 ...... Correct

algebraic expressions
4x-3 x=2 answer is 5...... Correct
Click to expand...

The first problem - being an equation of 2-nd degree, must have two solutions. The other solution is: x = 4 - √7

You could also write those together as: x = 4 ± √7
 
Subhotosh Khan said:
The first problem - being an equation of 2-nd degree, must have two solutions. The other solution is: x = 4 - √7

You could also write those together as: x = 4 ± √7
Click to expand...

So would i include both possible answers for the first question? Thank you!
 
HB09 said:
My new class does not have a book and this week doesnt give many examples. I was wondering if anyone could tell me if I answered these questions correctly or if I am missing anything? Im kind of at a stand still! Thank you

Quadratic Formula
-x^2+8x=9 answer x=4+√7
Click to expand...
How did you get this one answer? Why are you doubting the other helper, who provided you with the other answer?

To learn the various methods for solving quadratic equations, try here or here.

HB09 said:
Linear Equation
25x +50,000=80,000 answer 1200
Click to expand...
When you plugged "1,200" in for "x" in the original equation, did you get a true statement? If so, your answer is correct. If not, then it's not.

HB09 said:
algebraic expressions
4x-3 x=2 answer is 5
Click to expand...
Would it be correct the assume that the original exercise was along the lines of the following?


. . .\(\displaystyle \mbox{Evaluate the expression }\, 4x\, -\, 3\, \mbox{ when }\, x\, =\, 2.\)


If so, then your answer is correct. If not, please reply with corrections. Thank you! ;)
 
stapel said:
How did you get this one answer? Why are you doubting the other helper, who provided you with the other answer?

To learn the various methods for solving quadratic equations, try here or here.


When you plugged "1,200" in for "x" in the original equation, did you get a true statement? If so, your answer is correct. If not, then it's not.


Would it be correct the assume that the original exercise was along the lines of the following?


. . .\(\displaystyle \mbox{Evaluate the expression }\, 4x\, -\, 3\, \mbox{ when }\, x\, =\, 2.\)


If so, then your answer is correct. If not, please reply with corrections. Thank you! ;)
Click to expand...



I had both answers but didnt know you needed to provide both. I dont trust myself when it comes to math because I have never been great at it!
 
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