Question

Решите уравнения:
1)9/x-1=2x-5
2)|x|-3/x²-9=0

Answer 1

1)9/x-1=2x-5 x=0
9/x-1-2x+5=0
9/x+4-2x=0
9+4x-2x^2/x=0
9+4x-2x^2=0
-2x^2-4x-9=0
X=4±√16+72/4
X=4±√88/4
X=4±2√22/4
X¹=4+2√22/4
X²=4-2√22/4
X¹=2-√22/2
X²=2+√22/2