for what value of a is x² - ax - 6 divisible by x+2
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The Given equation is, x² - ax - 6
And, we've To find value of a
➟ x + 2 = 0
➟ x = -2
Put value of x in equation :
➝ x² - ax - 6 = 0
➝ (-2)² - (-2)a - 6 = 0
➝ 4 + 2a - 6 = 0
➝ 4 + 2a = 6
➝ 2a = 6 - 4
➝ 2a = 2
➝ a = 2/2
➝ a = 1
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