Question

How many real number solutions do these equations have?
y=5x^2+2x-12x
and

y=3x^2+18x+27

Answer 1

Use b^2 -4ac to determine no.of solution

if b^2 -4ac = 0 means two and equal root
if b^2 -4ac > 0 two different root
b^2 -4ac <0 no real root