Factorise : (i) a2−23a+42.(ii) a2−23a−108(iii) 1−18x−63x2(iv

1.	Factorise : (i) a2−23a+42.(ii) a2−23a−108(iii) 1−18x−63x2(iv) 5x2−4xy−12y2(v) x(3x+14)+8(vi) 5−4x(1+3x)(vii) x2y2−3xy−40(viii) (3x−2y)2−5(3x−2y)−24(ix) 12(a+b)2−(a+b)−35
Answer» Factorise : $(i) a^{2} - 23 a + 42. (i i) a^{2} - 23 a - 108 (i i i) 1 - 18 x - 63 x^{2} (i v) 5 x^{2} - 4 x y - 12 y^{2} (v) x (3 x + 14) + 8 (v i) 5 - 4 x (1 + 3 x) (v i i) x^{2} y^{2} - 3 x y - 40 (v i i i) (3 x - 2 y)^{2} - 5 (3 x - 2 y) - 24 (i x) 12 (a + b)^{2} - (a + b) - 35$

Factorise : (i) a2−23a+42.(ii) a2−23a−108(iii) 1−18x−63x2(iv) 5x2−4xy−12y2(v) x(3x+14)+8(vi) 5−4x(1+3x)(vii) x2y2−3xy−40(viii) (3x−2y)2−5(3x−2y)−24(ix) 12(a+b)2−(a+b)−35

Answer»

Factorise :

$(i) a^{2} - 23 a + 42. (i i) a^{2} - 23 a - 108 (i i i) 1 - 18 x - 63 x^{2} (i v) 5 x^{2} - 4 x y - 12 y^{2} (v) x (3 x + 14) + 8 (v i) 5 - 4 x (1 + 3 x) (v i i) x^{2} y^{2} - 3 x y - 40 (v i i i) (3 x - 2 y)^{2} - 5 (3 x - 2 y) - 24 (i x) 12 (a + b)^{2} - (a + b) - 35$

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Factorise : (i) a2−23a+42.(ii) a2−23a−108(iii) 1−18x−63x2(iv) 5x2−4xy−12y2(v) x(3x+14)+8(vi) 5−4x(1+3x)(vii) x2y2−3xy−40(viii) (3x−2y)2−5(3x−2y)−24(ix) 12(a+b)2−(a+b)−35

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