Equations, formulae and identities

Question 1

Quadratic formula

Answer 1

x=(-b±root(b²-4ac))/2a

Question 2

(x-2)²

Answer 2

(2-x)²

Question 3

Solve 3x + 4y = 5, 7x - 3y = 2 by elimination

Answer 3

9x +12y = 15
28x - 12y = 8
37x = 23
x = 23/37
y = 29/37

Question 4

Solve 3x + 4y = 5, 7x - 3y = 2 by substitution

Answer 4

x = (2 + 3y)/7
3((2 + 3y)/7) + 4y = 5
(6 + 9y)/7 + 4y = 5
6 + 9y + 28y = 35
37y = 29
y = 29/37
x = 23/37

Question 5

(a-1)/(a-2)

Answer 5

(1-a)/(2-a)

Question 6

A full circle

Answer 6

Greater/less than or equal to

Question 7

An empty circle

Answer 7

Greater/less than