Questions on Algebra: Square root, cubic root, N-th root answered by real tutors!

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 Algebra: Square root, cubic root, N-th root Solvers Lessons Answers archive Quiz In Depth

 Question 198572: Could someone help me with these, I had it last year but forgot how it works: 1) Find a quadratic equation with roots (4+i)and(4-i). 2) Given the equation x^3-2x^2+x-3=0, what are the possible rational roots?? 3) Find the irratinal roots of the equation; x^3-4x^2+2x+1=0 I should use the quadratic formula to solve the equation, it might sound stupid but I never really understood how to use the quadratic formula =( Click here to see answer by jim_thompson5910(28715)

 Question 198895: Find the value of square root of 30 to the nearest tenth. Click here to see answer by jim_thompson5910(28715)

 Question 198995: how can i solve this problem?? this fraction is square rooted so yeahhh its 81 over 49 ?????? help please Click here to see answer by jim_thompson5910(28715)

 Question 199164: Using rational exponents I need to rewrite the expression 8√ x^2 Click here to see answer by jim_thompson5910(28715)

 Question 199257: Could someone help me with these: What is the sum of the roots of the equation ax^2+bx+c=0 ? What is the product of their roots? How would I solve this equation x^3+2x^2+x+2=0, if -2 is a root? Click here to see answer by stanbon(57967)

 Question 199271: add or subtract. simplify when possible. 5 squareroot of 3/10 +2 squareroot of 5/6 -6 squareroot of 15/30 Click here to see answer by RAY100(1637)

 Question 199483: hey ya all thanx to your help I havent be around here for a while...but even the best of luck faids away sometimes, and I am back again, with problems again, would someone be as nice as to help me out here again? =) Please My problem; Approximate to the nearest tenth, the real root of the equation f(x)=x^3-4=0, I dont at all get this one. Click here to see answer by solver91311(17077)

 Question 199548: can you give me an example of this lesson? Click here to see answer by solver91311(17077)

 Question 199838: 3 + sqrt 3x - 2 = -5 Click here to see answer by jerrybassmasta(14)

 Question 199837: 13 sqrt 20 - 15 sqrt 32 - 8 sqrt 45 + 7 sqrt 8 Click here to see answer by RAY100(1637)
 Question 199837: 13 sqrt 20 - 15 sqrt 32 - 8 sqrt 45 + 7 sqrt 8 Click here to see answer by jim_thompson5910(28715)

 Question 199971: 5 times sqrt of 24 + sqrt of 81 + 3 times sqrt of 18 combine without calculator or table of square roots Click here to see answer by Alan3354(31518)
 Question 199971: 5 times sqrt of 24 + sqrt of 81 + 3 times sqrt of 18 combine without calculator or table of square roots Click here to see answer by tutorcecilia(2152)

 Question 199977: (sqrt of 12 - sqrt of 5)(sqrt of 5 + 2 times sqrt of 12) using the FOIL method..sorry I don't know how to do the sqrt sign with the keyboard. Click here to see answer by ankor@dixie-net.com(15746)

 Question 200045: sqrt of 52 divided by sqrt of 13 Click here to see answer by checkley77(12569)

 Question 200305: if 45 is n what is the expression for the number 35 in relation to n Click here to see answer by Alan3354(31518)

 Question 200784: (3 - 2 sqrt 7) * (3 + 2 sqrt 7) Click here to see answer by stanbon(57967)

 Question 200824: x^2 + x + sqrt x^2 + x – 2 = 0 Click here to see answer by RAY100(1637)

 Question 200953: The time t (in seconds) that it takes for a cliff diver to reach the water is a function of the height h (in feet) from which he dives: t = sqrt h /16 Find the exact time that it takes for a diver to hit the water when diving from 25 feet. Click here to see answer by solver91311(17077)

 Question 201007: Please help me in solving x^4-64. This is how I believe it's supposed to be solved x^4-64 I take the 4th root of x and get x, and the 3rd root of -64 and get -4, which can be simplified further to 2. My answer then is x-2. On the other hand I looked at factoring x^4-64 by factoring like so, (x^2+8)(x^2+8), then (x^2+8)(x+4)(x-2)but this would give me a middle term. Please help. Click here to see answer by Earlsdon(6294)

 Question 201100: The time t (in seconds) that it takes for a cliff diver to reach the water is a function of the height h (in feet) from which he dives: t = sqrt h /16 Find the exact time that it takes for a diver to hit the water when diving from 25 feet. t = sqrt h/16 = sqrt 25/16 Solve by factoring. z^2 - 3z - 18 = 0 -6 * 3 = -18 -6 + 3 = -3 Simplify the following radical: 3 − 64c^15/3 sqrt x^15 Click here to see answer by Alan3354(31518)