FUNCIONES CUADRÁTICAS

1. Y=x²-5x+6DomY= RRanY= 5/2=2.5 (2.5,-0.2)(2.5)²-5(2.5)+6=-0.2RanY=(-0.2,+∞)Interceptos• Con x= Y=x²-5x+6 0=x²-5x+6(x-3)(x-2) (3,0) (2,0)• Con y= Y=x²-5x+6 y=6 (0,6)

2. Y=x²-3x+2DomY= RRanY= 3/2=1.5 (1.5,-0.2)(1.5)²-3(1.5)+2= -0.2RanY= (-0.2,+∞)Interceptos• Conx= Y=x²-3x+2 0=x²-3x+2(x-2)(x-1) (2,0) (1,0)• Cony= Y=x²-3x+2 y=2 (0,2)

3. Y=x²+2x-8DomY= RRanY=-2/2=-1 (-1,-9)(-1)²+2(-1)-8=-9RanY==(-9,+∞)Interceptos• Conx= Y=x²+2x-8 0=x²+2x-8(x+4)(x-2) (-4,0) (2,0)• Cony= y=x²+2x-8 y=-8 (0,-8)

4. Y=x²-4x+3DomY= RRanY=4/2=2 (2,-1)(2)²-4(2)+3=-1RanY=(-1,+∞)Interceptos• Conx= Y=x²-4x+3 0=x²-4x+3(x-3)(x-1) (3,0)(1,0)• Cony= Y=x²-4x+3 y=3 (0,3)

5. Y=x²-7x-18DomY=∞RanY=7/2=3.5 (3.5,-30.2)(3.5)²-7(3.5)-18=-30.2RanY=(-30.2,+∞)Interceptos• Conx= Y=x²-7x-18 0=x²-7x-18(x-9)(x+2) (9,0) (-2,0)• Cony= y=x²-7x-18 y=-18 (0,-18)