Algebra

Question 1

Common quad equations

Answer 1

A^2 - B^2
= (a+b) (a-b)

(A+B)^2
= a^2 + 2ab + b^2

(A-B)^2
=A^2 - 2ab + b^2

Question 2

Roots of quadratic equation

Answer 2

X1 + X2 = -b / a

X1 * x2 = c/a

Question 3

Quad formula

Answer 3

• b + / - sq rt b^2 - 4ac
  Over
  2a

Question 4

B^2 - 4ac

No of roots

Answer 4

If > 0: 2 roots, crosses x axis twice

If = 0: 1 root, 1 x int

If < 0: no roots, never touches