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प्रश्न
Find the following product: (x + 7) (x − 5)
उत्तर
Here, we will use the identity \[\left( x + a \right)\left( x - b \right) = x^2 + \left( a - b \right)x - ab\].
\[\left( x + 7 \right)\left( x - 5 \right)\]
\[ = x^2 + \left( 7 - 5 \right)x - 7 \times 5\]
\[ = x^2 + 2x - 35\]
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