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Ecuații de gradul II, forma incompletă ​

Ecuații De Gradul II Forma Incompletă class=

Răspuns :

1) 2x²-15x=0

x(2x-15)=0

x=0

2x-15=0, 2x=15, x=7,5

R: S={0; 7,5}

2) 4x²+3x=0

x(4x+3)=0

x=0

4x+3=0, 4x=-3, x=-0,75

R: S={-0,75; 0}

3) x²+9x=0

x(x+9)=0

x=0

x+9=0, x=-9

R: S={-9; 0}

4) -12x²+x=0

x(-12x+1)=0

x=0

-12x+1=0, -12x=-1, x=1/12

R: S={0; 1/12}

5) -x²+42x=0

x(-x+42)=0

x=0

-x+42=0, x=42

R: S={0; 42}

6) 53x-x²=0

x(53-x)=0

x=0

53-x=0, x=53

R: S={0; 53}

7) 12x-36x²=0

x(12-36x)=0

x=0

12-36x=0, 36x=12, x=1/3

R: S={0; 1/3}

8) 81x-9x²=0

x(81-9x)=0

x=0

81-9x=0, 9x=81, x=9

R: S={0; 9}

9) 4x²-100x=0

x(4x-100)=0

x=0

4x-100=0, 4x=100, x=25

R: S={0; 25}

10) 31x-x²=0

x(31-x)=0

x=0

31-x=0, x=31

R: S={0; 31}