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प्रश्न
Find the following product: (x + 4) (x + 7)
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उत्तर
Here, we will use the identity
\[\left( x + a \right)\left( x + b \right) = x^2 + \left( a + b \right)x + ab .\]
\[\left( x + 4 \right)\left( x + 7 \right)\]
\[ = x^2 + \left( 4 + 7 \right)x + 4 \times 7\]
\[ = x^2 + 11x + 28\]
संबंधित प्रश्न
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Using suitable identities, evaluate the following.
(1005)2
Match the expressions of column I with that of column II:
| Column I | Column II |
| (1) (21x + 13y)2 | (a) 441x2 – 169y2 |
| (2) (21x – 13y)2 | (b) 441x2 + 169y2 + 546xy |
| (3) (21x – 13y)(21x + 13y) | (c) 441x2 + 169y2 – 546xy |
| (d) 441x2 – 169y2 + 546xy |
