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निम्नलिखित समीकरण को हल कीजिए –

(x + 2)(3x + 4)(3x + 7)(x + 3) = 2400

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दिया गया समीकरण,

{(x + 2)(3x + 7)} {(3x + 4)(x + 3)} = 2400

(3x2 + 7x + 6x + 14)(3x2 + 9x + 4x + 12) = 2400

(3x2 + 13x + 14) (3x2 + 13x + 12) = 2400

माना 3x2 + 13x = y

∴ दिया गया समीकरण (y + 14)(y + 12) = 2400

y2 + 14y + 12y + 168 = 2400y2 + 26y + 168 – 2400 = 0

y2 + 26y – 2232 = 0

y2 – 36y + 62y – 2232 = 0

y(y – 36) + 62(y – 36) = 0

(y – 36)(y + 62) = 0

जब y – 36 = 0 तब y = 36

जब y + 62 = 0 तब y = – 62

y = 36 लेने पर, 3x2 + 13x = 36

3x2 + 13x – 36 = 0

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