The graph of touches the -axis at exactly one point and does not cross it

MATHEMATICS · Single correct · GCSE · Mathematics · Algebra · Algebra

Problem

The graph of

y = ax^2 + bx + c

touches the

x

-axis at exactly one point and does not cross it. Which statement about its discriminant

D

is true? (a)

D > 0

(b)

D = 0

(c)

D < 0

(d)

D \le 0

but

a<0