Which number is the HCF (Highest Common Factor)of 9 and 81?, 3, 6, 9, 18, Find the HCF (Highest Common Factor) of 25 and 100., 5, 15, 25, 50, What is the HCF of 18k² and 30k?, 3k, 6k, 2k, 6, What is the HCF of 15x²y and 25xy3?, 5x, 5xy, 5y, xy, Which of the following algebraic expressions has an HCF of 2?, 4x + 12, 3x + 6, 6x + 10, 5x + 2, Factorise the expression 8x + 32., 4(2x + 8), 8(x + 4), 2(4x + 16), 8(x + 32), Factorise the expression 7a + 35ab., 7(a + 5ab), a(7 + 35b), 7a(1 + 5b), 7a(5b), Factorise the expression 121a + 55ab., 11(11a + 5ab), a(121 + 55b), 11a(11 + 5b), 5a(22 + 11b), Factorise the expression p²qr + p²q²r., p2qr(1 + q), pqr(1 + q), pqr(p + pq), pqr(1 + pq), Factorise the expression x2y2– xy + 3xy2., xy(xy2 - y + 3y2), xy(xy - 1 + 3y), x(xy2 - y + 3y2), 1xy(xy + 3y).

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