(x + 3)(1 – 2x) = ?

(x + 3)(1 – 2 x) = x – 2 x ² + 3 – 6 x

= –2 x ² – 5 x + 3

a(b + c) = ab + ac

(a + b)(c + d) = ac + ad + bc + bd

(a + b)² = a² + 2ab + b²

(a – b)² = a² – 2ab + b²

(a + b)(a – b) = a² – b²

a b a b

a b a b

a b a b

a b a b

t

n

n

n