# Questions on Algebra: Equations answered by real tutors!

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 Algebra: Equations Solvers Lessons Answers archive Quiz In Depth

 Question 193714: I am having trouble solving for x. .07 + 3x - 4.2 = 9x + 3.6 - 7x The chapter did not cover more than one x so I am confused about equaling out the sides. I simplify it and get an answer of 6.5 * x = 5.6 * x I am sure that I am very wrong! Thank you for your help! Click here to see answer by Mathtut(3670)

 Question 193773: Create a real-life situation that fits into the equation (x + 3)(x - 5) = 0 and express the situation as the same equation. Click here to see answer by Mathtut(3670)

 Question 193772: What type of solution do you get for quadratic equations where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solution of the equation. Click here to see answer by Alan3354(30982)

 Question 193774: I have tried this equation numerous times.. but I can't seem to get the time. Here is the problem : Find the time required for an investment of 5000 dollars to grow to 6400 dollars at an interest rate of 7.5 percent per year, compounded quarterly. Here is what I have done: 6400=5000(1+(0.075/4))^4t 5000(1+(0.075/4))^4t=6400 5000(1+.01875)^4t=6400 5000/5000(1.01875)^4t=6400/5000 (1.01875)^4t=1.28 4t*ln(1.01875)=ln(1.28) t=ln(1.28)/4*ln(1.01875) Click here to see answer by Alan3354(30982)

 Question 193789: Hello, I have a problem with the following exponential equation, each time I try to solve it, I keep getting the wrong answer, could you look at my work and see what I am doing wrong? Thank you in advance. Problem : 2^2x+4=3^x-21 This is what I have done so far : ln(2)^2x+4=ln(3)^x-21 (2x+4)ln(2)= (x-21)ln(3) 2x*ln(2)+4*ln(2)=x*ln(3)-21*ln(3) 2x*ln(2)+x*ln(3)= -4*ln(2)-21*ln(3) x(ln(3)+2*ln(2))=4*ln(2)-21*ln(3) x= 4*ln(2)-21*ln(3)/ln(3)+2*ln(2) Click here to see answer by RAY100(1637)

 Question 193642: I dont understand how to find the time required for an investment Problem: Find the time required for an investment of 5000 dollars to grow to 6400 dollars at an interest rate of 7.5 percent per year, compounded quarterly. I used the compound interest formula A=P(1+(r/n))^nt but I have no idea how to get the time. Could someone please help? Click here to see answer by ankor@dixie-net.com(15634)

 Question 193949: Determine the type (real or complex) and number of the solutions of each of the following equations. Justify your answer. x^2 + 3x - 15 = 0 Thank you Click here to see answer by jim_thompson5910(28503)

 Question 194041: i need to multiply and simplify this problem. (2x+4)(2x+4) thank youu Click here to see answer by jim_thompson5910(28503)

 Question 194077: Solve for a factor of 3x^3 + 7x^2 - x + 15 ... is (x-3) a factor of this? Click here to see answer by stanbon(57239)

 Question 194086: what do you do if the equation is doesn't have one thing the other one does example : 2a- 5 = 3a Click here to see answer by jim_thompson5910(28503)

 Question 194080: If P(x) = 3x^5 - 8x^4 + 3x^3 + 2x^2 - 16x + 14, then P(3) = ? ...is it 682? Click here to see answer by Edwin McCravy(8881)
 Question 194080: If P(x) = 3x^5 - 8x^4 + 3x^3 + 2x^2 - 16x + 14, then P(3) = ? ...is it 682? Click here to see answer by jim_thompson5910(28503)

 Question 194095: Find each sum or difference 2x over x-2 minus x over 2-x Click here to see answer by edjones(7569)

 Question 194126: What type of solutions do you get from a quadratic equation where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solutions of the equation. Thank You Click here to see answer by Mathtut(3670)

 Question 194125: Determine the type (real or complex) and number of the solutions of each of the following equations. Justify your answer. x^2 + x + 4 = 0 Thank You Click here to see answer by Mathtut(3670)

 Question 194179: Determine the number of solutions and classify the type of solutions for each of the following equations. Justify your answer. 4x2 + 16x + 16 = 0 Click here to see answer by RAY100(1637)

 Question 194177: Determine the number of solutions and classify the type of solutions for each of the following equations. Justify your answer. x2 – 4x - 77 = 0 Click here to see answer by RAY100(1637)

 Question 194292: 27 7/3 over 27 8/3= 1/27 Did I figure this out right? Click here to see answer by checkley77(12569)