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प्रश्न
Expand the following:
(x - 5) (x - 4)
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उत्तर
(x - 5) (x - 4)
= x2 -5x - 4x + 20
= x2 - 9x + 20
(Using identify : (x - a) (x - b)
= x2 - (a + b) x + ab).
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