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Find the value of x if [1x1][1322511532][12x] = 0 - Mathematics

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प्रश्न

Find the value of x if `[(1, x, 1)] [(1, 3, 2),(2, 5,1),(15, 3, 2)] [(1),(2),(x)]` = 0

योग
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उत्तर

Given that `[(1, x, 1)] [(1, 3, 2),(2, 5,1),(15, 3, 2)] [(1),(2),(x)]` = 0

⇒ `[(1 + 2x + 15, 3 + 5x + 3, 2 + x + 2)] [(1),(2),(x)]` = 0

⇒ `[(2x + 16, 5x  + 6, x + 4)] [(1),(2),(x)]` = 0

⇒ [2x + 16 + 10x + 12 + x2 + 4x] = 0

⇒ x2 + 16x + 28 = 0

⇒ x2 + 14x + 2x + 28 = 0

⇒ x(x + 14) + 2(x + 14) = 0

⇒ (x + 2)(x + 14) = 0

x + 2 = 0 or x + 14 = 0

∴ x = – 2 or x = – 14

Hence, the values of x are – 2 and – 14.

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अध्याय 3: Matrices - Exercise [पृष्ठ ५४]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 12
अध्याय 3 Matrices
Exercise | Q 10 | पृष्ठ ५४
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