maths
posted by anonymous .
rationalise 5+2square root 5 divided by square root 5.
please can someone help me on how to get the answer 2+square root 5

maths 
bobpursley
(5+2sqrt5)/sqrt5 * (sqrt5/sqrt5)=
(2*sqrt5*sqrt5+5sqrt5)/(sqrt5*sqrt5)=
(2*5+5sqrt5)/5=2+sqrt5 
maths 
anonymous
but how do you get 2*5+5squared root 5 to become 2+sqrt5 ?
Respond to this Question
Similar Questions

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 … 
Math
Rationalize the denominator. Assume that all expressions under radicals represent positive numbers. The square root of 3y^4 to the third root divided by the square root of 15x^4 to the third root. Here is what I have so far: I multiplied. … 
maths
rationalise 5+2square root 5 divided by square root 5. please can someone help me on how to get the answer 2+square root 5 
maths
rationalise 5+2square root 5 divided by square root 5. please can someone help me on how to get the answer 2+square root 5 
Algebra
Rationalize each expression by building perfect nth root factors for each denominator. Assume all variables represent positive quantities. I don’t understand how to compute these. Also I don’t have the square root sign so I typed … 
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 … 
Math ~CHECK MY ANSWER~
1) Which of these is a rational number? a. Pi b. Square root 3 ****** c. Square root 2 d. 1.3 (the # 3 has a line at the top) 2) Which of the following sets contains 3 irrational numbers? 
Calculus
A rectangle is bounded by the x axis and the semicircle = square root 25x^2. What length and width should the rectangle have so that its area is a maximum? 
Pre Algebra
State if each number is Rational,Irrational,or not a real number?