दिया गया समीकरण
(x2 – 3x + 3)2 – (x – 1)(x – 2) = 7
(x2 – 3x + 2 + 1)2 – (x2 – 3x + 2) – 7 = 0 …(1)
समीकरण (1) में x2 – 3x + 2 = y रखने पर
(y + 1)2 – y – 7 = 0
y2 + 1 + 2y – y – 7 = 0
y2 + y – 6 = 0
y2 + 3y – 2y – 6 = 0
y(y + 3) – 2(y + 3) = 0
(y – 2)(y + 3) = 0
y = 2, – 3
जब y = 2 ⇒ x2 – 3x + 2 = 2
x2 – 3x = 0
x(x – 3) = 0
x= 0, 3
जब y = – 3 ⇒ x2 – 3x + 2 = – 3
x2 – 3x + 2 + 3 = 0
x2 – 3x + 5 = 0
