Thread: Radical fraction

how would I write 4/√7 with a fraction whose denominator is even?

Thanks

Originally Posted by drewm

how would I write 4/√7 with a fraction whose denominator is even?

ok thanks, but can you tell me how you got that?

Originally Posted by drewm

ok thanks, but can you tell me how you got that?

I multiplied numerator and denominator by

Originally Posted by drewm

how would I write 4/√7 with a fraction whose denominator is even?

Thanks

If you think about it another way - you need to multiply top and bottom by to rationalise the denominator. However, 7 is not an even number so you must multiply top and bottom by since multiplying any integer by 2 gives an even number.

Plato did the same thing but combined the steps

Like they said add 2 in front of the radical, there you would multiply .