Factorising Flashcards

1
Q

x ^2 - a^2

A

(x - a)(x + a)

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2
Q

x^3 - a^3

A

(x - a)(x^2 + ax + a^2)

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3
Q

x^3 + a^3

A

(x + a)(x^2 - ax + a^2)

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4
Q

discriminant

A

b^2 – 4ac

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5
Q

quadratic formula

A

-b ± √(b2 - 4ac)]/2a

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6
Q

complete the square

A

(x+b/2)^2 - (b/2)^2 + c

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7
Q

angle and gradient formula

A

m = tan (θ)
θ = tan^-1 (m)

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8
Q

distance formula

A

√(x2 - x1)^2 + (y2 - y1)^2

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9
Q

gradient formula

A

y2 - y1/x2 - x1

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10
Q

midpoint formula

A

(x2 + x1/2 , y1 + y2/2)

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