Question

Find the value of “x” in the polynomial 2a2 + 2xa + 5a + 10 if (a + x) is one of its factors.​

Answer 1

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Say,$f(a) = 2a^2 + 2xa + 5a + 10$

Since,$(a + x) is\: a \:factor\: of\: 2a^2 + 2xa + 5a + 10, f(-x) = 0$

So,$f(-x) = 2x^2 – 2x^2 – 5x + 10 = 0$

Or, $-5x + 10 = 0$

Thus, $x = 2$

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Answer 2

Answer:

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