Factorise the following polynomials: 5ph – 10qk + 2rph – 4qrk

(i) 5ph – 10qk + 2rph – 4qrk
(ii) x² – x(a + 2b) + 2a²

Solution:

(i) ab (x² + y²) – xy (a² + b²)
(ii) (ax + by)² + (bx – ay)²

Solution:

(i) a³ + ab(1 – 2a) – 2b²
(ii) 3x²y – 3xy + 12x – 12

Solution:

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