Question

Rasionalkan: x^2-9/√x^2+7x-4?

Answer 1

(x²-9) / √(x²+7x-4) 
= [(x²-9) / √(x²+7x-4)].[√(x²+7x-4) / √(x²+7x-4)]
= [(x²-9).√(x²+7x-4)] / (x²+7x-4) ....ga bisa disederhanain lagi