Question

3x²-12=0 x²-7x-18=0 2x²-5x=0 3x³-x+2=0 Ajutați va rog, in ecuați nus puternik, day coroană

Answer 1

Explicație pas cu pas:

3x²-12=0

x²-4=0

x²=4

x= ± 2

x= -2

x= 2

x1= -2

x2 = 2

x²-7x-18=0

x² + 2x-9x-18=0

x ×(x+2)-9(x+2)=0

(x+2)×(x-9)=0

x+2=0

x-9=0

x= -2

x=9

x1= -2

x2= 9

2x²-5x=0

x ×(2x-5)=0

x=0

2x-5=0

x=0

x= 5\2

x1=0

x2= 5\2

(formular alternativ)

x1 =0

x2= 2,5

3x³-x+2=0

3x³+3x²-3x²-3x+2x+2=0

3x²× (x+1)-3x ×(x+1) +2(x+1)=0

(x+1)×(3x²-3x+2)=0

x+1=0

3x²-3x+2=0

x=-1

x apartine lui R

Soluţia x= -1