Question

Dau coroana
Rezolvati ecuatiile: 
a) (2x²-5x-12)(x²-2)=0
b) (3x²+2x-5)(4x²-5x+1)=0
c) $\frac{ x^{2} +5}{ x^{2} +x+ 1}$ - 2=0
Am nevoie de ajutor. Multumesc.

Answer 1

a)(2x²-5x-12)(x²-2)=0
2x²-5x-12=0
∆=121
x1=4
x2=-3/2

x²-2=0
(x-√2)(x+√2)=0
x3=√2
x4=-√2

b)(3x²+2x-5)(4x²-5x+1)=0
3x²+2x-5=0
∆=4+60=64
x1=-2+8/6=1
x2=-10/6=-5/3

4x²-5x+1=0
∆=25-16=9
x3=5+3/8=1
x4=5-3/8=-1/4

c il ai in poza