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How do you factor the expression (d2+10d+9)?

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-9, -1

1, 9

4, 5

-5, -4

answer is A.

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Detailed Solution

\Rightarrow

(d2+10d+9)

\Rightarrow

d2+9d+d+9

\Rightarrow

d(9+d)+1((9+d)

\Rightarrow

(9+d)(d+1)
     By zero theorem
            (9+d)(d+1)=0
d=-9, d=-1
Option 1 is correct

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