write 2/(3+root(5)) in the form a + b*root(5), where a and b are rational numbers.
You would first multiply the expression by (3-root(5))/(3-root(5) - which equals 1 - to get (6-2root(5))/14 which then equals 3/7 - (1/7)*root(5) and you are done.
MG
Related Maths GCSE answers
All answers ▸In a triangle ABC, side BC = 8.1 cm, side AC = 7 cm, and angle ACB = 30 degrees. What is the area of the triangle?
differentiate x^3(1+x)^5 with respect for x
How would you work out the length of an hypotenuse, if the length of the opposite side is 3 cm and the length of the opposite side is 4 cm?
(2x-5)(3x+2)(x+7) - Expand the brackets.