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CBSE Class 10 Answered

2. If (x + a) is a factor of 2x2 + 2ax + 5x + 10, find a.
Asked by jaiacharya18 | 17 Feb, 2019, 10:44: AM
answered-by-expert Expert Answer
f(x) = 2x2 + 2ax +5x +10 = 0
 
if (x+a) is a factor, then f(-a) = 0
 
hence, f(-a) = 2(-a)2 +2a(-a) +5(-a) +10 = 0   or  a = 2
Answered by Thiyagarajan K | 17 Feb, 2019, 11:55: AM

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