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Answer :
(i)We have: \(7x – 42 = 7(x – 6)\)
(ii)We have: \(6p – 12q = 6(p – 2q)\)
(iii) We have: \(7a^2 + 14a = 7a(a + 2)\)
(iv)We have: \(-16z + 20z^3 = 4z(-4 + 5z^2)\)
(v) We have: \(20l^2m + 30alm = 10lm(2l + 3a)\)
(vi) We have: \(5x^2y – 15xy^2 = 5xy(x – 3y)\)
(vii) We have: \(10a^2 – 15b^2 + 20c^2 = 5(2a^2 – 3b^2 + 4c^2)\)
(viii)We have: \(-4a^2 + 4ab – 4ca = 4a(-a + b – c)\)
(ix)We have: \(x^2yz + xy^2z + xyz^2 = xyz(x + y + z)\)
(x) We have: \(ax^2y + bxy^2 + cxyz = xy(ax + by + cz)\)