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Question

The coefficient of x in (x+7)(x9) is

A
-2
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B
0.0
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C
1
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D
-1
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Solution

The correct option is A -2
(x+a)(xb)=x2+(ab)xab

(x+7)(x9)=x2+(79)x(7)(9)

= x22x63

coefficient of x is -2

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