Question

factorise (2x-y-z)3 +(2yzx)3 +(2zxy)3

Answer 1

factorise (2x-y-z)3 +(2yzx)3 +(2zxy)3 Hence x2 + 4x − 21 ≡ (x − 3)(x + 7). 3 Note: For simple cases, carry out the factorisation entirely by inspection. x2