1.

If x+a is a factor of `2x^(2)+2ax+5x+10`, find the value of a.

Answer» Correct Answer - a = 2
Let ` f(x) = 2x^(2) + 2ax + 5x + 10.`
Since (x+a) is a factor of f(x), we have `f(-a) = 0`.
`:. 2(-a)^(2) + 2a (-a) + 5(-a) + 10 = 0`
` rArr 2a^(2) - 2a^(2) - 5a + 10 = 0 rArr 5a = 10 rArr a = 2.`


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