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Slope-intercept form

y = mx + b

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Slope formula

m = y1 - y2/x1 - x2

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Point-slope form

y-y1 = m(x - x1)

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Matrix equations

Ax = B

x = A^-1B

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Vertex form

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

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Axis of symmetry (Vertex form)

x = h

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Vertex (Vertex form)

(h, k)

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Standard form

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

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Axis of symmetry (Standard form)

x = -b/2a

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Vertex (Standard form)

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

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Difference of two squares

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

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Perfect-square trinomial

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

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

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