Discussion
By factorizing following expression 5ab + 10ac + 15ad, answer must be
Answer: B
Every term shares the factor \( 5a \).
\[ 5ab + 10ac + 15ad = 5a(b + 2c + 3d) \]
Checking: \( 5a \times b = 5ab \), \( 5a \times 2c = 10ac \), \( 5a \times 3d = 15ad \). Taking out 5 alone would leave the \( a \) behind in each term.
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