math
posted by layth
x.y=30 and x+y=10.3, I end up with
x=(21.83+60.66i)/(5.155.89i).
i is the square root of (1).
could you please show me how this equation will = 10.3
I am having problem to figure it out.
thank you.

MathMate
It is a similar problem of having a rectangle of area 30 units and the semiperimeter is 10.3.
Using calculus, we find that the minimum real semiperimeter is 2√30=10.95.
Unless you are working with complex numbers, there is a good chance that there is erroneous data in the question. Did you derive the data (like 10.3) from an experiment, or was it calculated from some other sources? 
layth
my Teacher gave this problem

MathMate
Ask the teacher if he/she expects complex roots, which are approx. 5.15±1.86i.

layth
if my teacher expects complex roots, what will be the final answer if i add x+y = 10.3 = ??
thank you 
MathMate
If
x=5.15+1.86i
y=5.151.86i
xy=29.98
x+y=10.3
Note that numerical values are rounded (except 5.15).
Do the multiplication as an exercise.
Respond to this Question
Similar Questions

math
Let F1=(6,0) ,F2=(6,0) A=(10,0)64 + and B=(10,0) write an equation of the set of all points p(x,y) such that (PF1/pluse /PF2/=20. now i know the problem is the square root of (x+6)^2 +y^2 + the square root of (x  6)^2 + y^2 = 20 … 
Algebra 2
could you walk me thorugh these problems simplfy square root 18  3 times sqaure root of 50 plus 5 times the square root of 80  2 times the square root of 125 I'm having troubles with the square root of 80 all of the other radicals … 
Algebra
Use the quadratic formula to solve the equation. Give exact answers: 2x^2 1 = 6x. The choices are: a) 3 + square root(7)/2, 3  square root(7)/2 b) 3 + square root(11)/2, 3  square root(11)/2 c) 3 + square root(7)/2, 3  square … 
algebra
if x.y=30 and x+y=10.3, what is x? i been told by my teacher to use quadratic formula , and him and i did it , we end up having , x1=5.155.89i and x2=5.15+5.89i, y1=30/(5.155.89i) and y2=30/(5.15+5.89i).and he told to go from 
math
x=(5.155.89i).(30/(5.155.89i)) i is the suare root of (1) what is x. please help me , i cant figure it out. thank you. 
math
x=(5.155.89i)+(30/(5.155.89i)) i is the square root of (1) the answer sholud equal 10.3 x=10.3 but could you show me how , i am having problem to figure it out. thank you. 
math
x=(21.83+60.66i)/(5.155.89i) i is the square root of (1) then x should equal 10.3 but i do not know how to figure it out please show me hoe thank you 
square roots
i know this problem is really easy but i am having a brain freeze day will someone please help me figure out what the square root of 32 is? 
Math simplifying mixed radicals
Please help me simplify these following mixed radicals:: and show me how you did it cause I need to learn : I don't know how to type a square root sign so I just wrote square root: 2 square root 48 3 square root 81 6 square root 12 … 
Math simplifying mixed radicals
Please help me simplify these following mixed radicals:: and show me how you did it cause I need to learn : I don't know how to type a square root sign so I just wrote square root and the numbers infront of the square root are supposed …