Solve for x:

(i)


(ii)


(iii)


(iv)

(i)



3(x– 1)(x – 4) + 3(x – 2)(x – 3) = 10(x – 2)(x – 4)


3x2 + 12 – 15x + 3x2 + 18 – 15x = 10x2 – 60x + 80


4x2 – 30x + 50 = 0


2x2 – 15x + 25 = 0


2x2 – 10x – 5x + 25 = 0


2x(x – 5) – 5(x – 5) = 0


(2x – 5)(x – 5) = 0


Thus, x = 5/2, 5.


(ii)



x – 2 – x = 3x2 – 6x


3x2 – 6x + 2 = 0


Using




(iii)



x2 – 3x + 1 = 0


Using


x = (3 � √(9 – 4))/2


x = (3 � √5)/2


(iv)



(16 – x)(x + 1) = 15x


16x – x2 + 16 – x = 15x


x2 = 16


x = �4


3