Equations, formulae and identities Flashcards
1
Q
Quadratic formula
A
x=(-b±root(b2-4ac))/2a
2
Q
(x-2)2
A
(2-x)2
3
Q
Solve 3x + 4y = 5, 7x - 3y = 2 by elimination
A
9x +12y = 15
28x - 12y = 8
37x = 23
x = 23/37
y = 29/37
4
Q
Solve 3x + 4y = 5, 7x - 3y = 2 by substitution
A
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
5
Q
(a-1)/(a-2)
A
(1-a)/(2-a)
6
Q
A full circle
A
Greater/less than or equal to
7
Q
An empty circle
A
Greater/less than
8
Q
What equation represent y is directly proportional to x?
A
y = kx
9
Q
What is the completed square form of ax2+bx+c?
A
a(x+b/2a)2-a(b/2)2+c
