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प्रश्न
Factorise the following.
x2 + 9x + 20
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उत्तर
We have,
x2 + 9x + 20
= x2 + 5x + 4x + 5 × 4
= x(x + 5) + 4(x + 5)
= (x + 5)(x + 4)
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