# Questions on Algebra: Inverse operations for addition and multiplication, reciprocals answered by real tutors!

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 Algebra: Inverse operations for addition and multiplication, reciprocals Solvers Lessons Answers archive Quiz In Depth

 Question 477189: Which value of x is not allowed in this fraction x^2 ______ 1+2x I was shown the answer but don't understand why. The explanation didn't make sense, so I am looking for someone else who can explain why the answer is what it is. Click here to see answer by Alan3354(30993)

 Question 477888: What is the inverse of f(x)=(x-7)^3 I know you change out f(x) to y: y=(x-7)^3 Then swap x and y: x=(y-7)^3...But now I am stuck as to what numbers will come back over with y..Can you help? Click here to see answer by mangopeeler07(462)

 Question 479631: the sum of a number and its reciprocal is 34/15 Click here to see answer by MathLover1(6638)

 Question 479950: what is a counter example for the reciprocal of each natural number is a natural number Click here to see answer by tinbar(128)

 Question 479953: what is a counterexample for the opposite of each whole number is a whole number Click here to see answer by tinbar(128)

 Question 481128: The one-to-one function is defined by f(x) = x/(8-9x) Find f^-1, the inverse of f . Then, give the domain and range of f^-1 using interval notation. Click here to see answer by stanbon(57387)
 Question 481128: The one-to-one function is defined by f(x) = x/(8-9x) Find f^-1, the inverse of f . Then, give the domain and range of f^-1 using interval notation. Click here to see answer by Theo(3464)

 Question 482432: what do you do to find the reciprocal of a number? Click here to see answer by stanbon(57387)

 Question 482440: x + 3 = m How do you find the value of x? Click here to see answer by richard1234(5390)

 Question 484955: use the commutative law of multiplication to write an equivalent expression a(s+3) Click here to see answer by Tatiana_Stebko(1326)

 Question 485641: how to write 5 more than the product of a number and 3 Click here to see answer by Theo(3464)

 Question 487294: my step-daughter saw an algebra problem that had an exclamation point ( ! )in the expression looking like this ... 4! ... with an answer that the teacher said was correct. What does the ! mean in algebra? Click here to see answer by josmiceli(9697)

 Question 487402: 1 simplify 0/8 2 simplfy -7y - (-4y + 8) Click here to see answer by unlockmath(1603)

 Question 489117: perform the indicated operation and, if possible simplify. show all of your work -28/39 / 20/9 Click here to see answer by rfer(12670)

 Question 489123: perform the indicated operation and, if possible simplify. show all of your work 3/4-{-5/8} Click here to see answer by rfer(12670)

 Question 489126: perform the indicated operation and, if possible simplify. show all of your work 1/11+{-5/6} Click here to see answer by rfer(12670)

 Question 489116: evaluate and if possible, simplify 30/-15-x for x=-15 Click here to see answer by rfer(12670)

 Question 489479: if f^-1 is the inverse of f, determine the value of f(f^-1(5)) Click here to see answer by richard1234(5390)

 Question 490583: When comparing two numbers for the "mid value" such as: 34 x 56/ 34 + 56 =x the problem is self explanatory. But, I am trying to solve the same type of problem with the answer known and one of the numbers an unkown, such as: 34 x X/34 + X = 21.1555 Everything I have tried tells me I don't know how to approach this problem Can you please help? Thanks, Quaedan Click here to see answer by Edwin McCravy(8909)

 Question 494143: how do we solve 2x +15 = 3x ? Click here to see answer by rfer(12670)

 Question 494830: What is the inverse of multiplying by 2 Click here to see answer by nerdybill(6962)

 Question 499262: x-4=15 I tried adding 4 to 15 and four and x and four but I could not figure it out. Click here to see answer by Alan3354(30993)
 Question 499262: x-4=15 I tried adding 4 to 15 and four and x and four but I could not figure it out. Click here to see answer by deborabr(181)

 Question 494473: what is the multiplicative inverse or reciprocal, of 2 2/5 ? Click here to see answer by Flannery(124)

 Question 500931: CAN YOU WORK THIS PROBLEM OUT AND SHOW YOUR WORK 5 * 64Y ------- 32 * 100 Click here to see answer by Flannery(124)

 Question 489297: "What is a middle school level example of inverse operations?" Click here to see answer by Flannery(124)