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Question 2(i)
Use the identity (x+a)(x+b)=x2+(a+b)x+ab to find the following products:
(x+3)(x+7)


Solution

(x+3)(x+7)=(x)2+(3+7)x+3×7
=x2+10x+21    [Using identity (x+a)(x+b)=x2+(a+b)x+ab]

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