Question

Expand (2x - y)^4.

Answer 1

Equation: \[(2x - y)^{4}\]

Answer 2

\[(2x-y)^2(2x-y)^2\]\[(a-b)^2 \implies (2x-y)^2 = 4x^2-4xy+y^2\]

Answer 3

So essentially you're just multiplying \[(4x^2-4xy+y^2)(4x^2-4xy+y^2)\]

Answer 4

Alternate way is to use binomial expansion theorem by using pascal's triangle

Answer 5

@Jhannybean - Do you know how to use Pascal's triangle?