Reasoning By finding the turning point and whether it is a maximum or a minimum, decide
whether each quadratic equation has
• two roots
• no roots
a y=x²+6x+11
e y=-x²+2x-5
by=x²+4x-3
fy=2x²-8x+5
cy=x²-6x-12
g y=-2x²-12x-18
one repeated root
dy = 3x² + 12x+12
hy=-3x²-2x+1