9/akar 7-2 jawab sekarang yah makasih

Rasionalkan!
9/√7 - 2 x (√7+2)/(√7+2)
= 9(√7+2)/7-4
= (9√7 + 18)/3 ( sama-sama dibagi 3)
= 3√7 + 6

9/√7-2
= 9/√7-2 × √7+2/√7+2
= 9(√7+2)/7+√14-√14 - 4
= 9(√7+2)/7-4
= 9(√7+2)/3
= 3(√7+2)