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Fill in the blank: $(x + □) (x + 3) = x^{2} + 10 x + 21$

Class 8Multiplying PolynomialsAlgebra

A21
B7
C18
D10

Step-by-Step Solution

The constants multiply to 21 and add to 10:

7 \times 3 = 21, 7 + 3 = 10

. So the blank is 7.

Answer: B) 7

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