Question

me ajudem pf

letra a) (x+1).(x-2)>0

letra b) (-3x+3).(-x+5)<0

Answer 1

a)x^2-x+x-2>0
x^2-2>0
x^2>2
x>√2

b)3x^2-15x-3x+15 <0
3x^2-18x+15<0
Δ=18^2-4•3•15
Δ=324-180
Δ=144

```````18+-√144
x<________
``````````````6
````````18+12 ```````````40
X'<_____<_________
``````````6 ````````````````6

x'<6,6666666

`````````18-40`````````````-36
x"<________<________
'''''''''''''''6``````````````````````6
x"<-6

X'<6,6666
X"<-6