###
Slope-intercept form

y = mx + b

###
Slope formula

m = y1 - y2/x1 - x2

###
Point-slope form

y-y1 = m(x - x1)

###
Matrix equations

Ax = B

x = A^-1B

###
Vertex form

f(x) = a(x - h)^2 + k

###
Axis of symmetry (Vertex form)

x = h

###
Vertex (Vertex form)

(h, k)

###
Standard form

f(x) = ax^2 + bx + c

###
Axis of symmetry (Standard form)

x = -b/2a

###
Vertex (Standard form)

(-b/2a, f(-b/2a))

###
Difference of two squares

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

###
Perfect-square trinomial

a^2 - 2ab + b^2 = (a - b)^2

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

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.