Quadratics

Question 1

Quadratic formula

Answer 1

-b+- root(b2-4ac)/2a

Question 2

Two real roots

Answer 2

b2 - 4ac > 0

Question 3

One real root

Answer 3

b2 - 4ac = 0

Question 4

No real roots

Answer 4

b2 - 4ac < 0

Question 5

Shape

Answer 5

a = positive
graph u shaped
a = negative
graph is n shaped

Question 6

Y intercept

Answer 6

Substitute x=0 into equation

Question 7

X intercept

Answer 7

Substitute y=0 into equation and solve

Question 8

Vertex

Answer 8

Complete the square

Question 9

Finding where lines intersect

Answer 9

Solve simultaneous equations

Question 10

Co ordinates of the vertex

Answer 10

y = a(x-b)2 + c

Question 11

Value of the x intercepts

Answer 11

y = a(x-b)(x-c)

Question 12

Don’t know the vertex or x intercepts

Answer 12

y = ax2 - bx + c