[" alm "],[" (vii) "10a^(2)-15b^(2)+20c^(2)]

Factorise the following expressions. (i) 7x - 42 (ii) 6p - 12q (iii) 7a^2 + 14a (iv) -16z + 20z^3 (v) 20l^2m + 30a l m (vi) 5x^2y - 15xy^2 (vii) 10a^2 - 15b^2 + 20c^2 (viii) -4a2 + 4ab - 4ca (ix) x^2yz + xy^2z + xyz^2 (x) ax^2y + bxy^2 + cxyz

Factorise the following expressions. (i) 7x - 42 (ii) 6p - 12q (iii) 7a^2 + 14a (iv) -16z + 20z^3 (v) 20l^2m + 30a l m (vi) 5x^2y - 15xy^2 (vii) 10a^2 - 15b^2 + 20c^2 (viii) -4a^2 + 4ab - 4ca (ix) x^2yz + xy^2z + xyz^2 (x) ax^2y + bxy^2 + cxyz

Identify like terms in the following: 4ab, 7a, 8b, -3a^(2)b^(2), - 4ba, -50b, - 75, 15b^(2)a^(2), - 7a^(2), 45, 150a, 70ba, 10a^(2)b, - 15ab^(2), 3ba^(2), - 21a^(2), 7b^(2)a .

(vii) (b^(2) +c^(2) -a^(2)) tan A = (a^(2) -b^(2) +c^(2))tan B

The value of 15C_(0)^(2)-15C_(1)^(2)+^(15)C_(2)^(2)...-^(15)C_(15)^(2) is 15b-15c.0d.51