Mathematics
Find the zero of the polynomial in each of the following cases:
(i) p(x) = x + 5
(ii) p(x) = x - 5
(iii) p(x) = 2x + 5
(iv) p(x) = 3x - 2
(v) p(x) = 3x
(vi) p(x) = ax, a ≠ 0
(vii) p(x) = cx + d, c ≠ 0, c, d are real numbers.
Polynomials
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Answer
(i) p(x) = x + 5
⇒ p(x) = 0
⇒ x + 5 = 0
⇒ x = -5
Hence, -5 is a zero of polynomial x + 5
(ii) p(x) = x - 5
⇒ p(x) = 0
⇒ x - 5 = 0
⇒ x = 5
Hence, 5 is a zero of polynomial x - 5
(iii) p(x) = 2x + 5
⇒ p(x) = 0
⇒ 2x + 5 = 0
⇒ 2x = -5
⇒ x =
Hence, is a zero of polynomial 2x + 5
(iv) p(x) = 3x - 2
⇒ p(x) = 0
⇒ 3x - 2 = 0
⇒ 3x = 2
⇒ x =
Hence, is a zero of polynomial 3x - 2
(v) p(x) = 3x
⇒ p(x) = 0
⇒ 3x = 0
⇒ x =
⇒ x = 0
Hence, 0 is a zero of polynomial 3x
(vi) p(x) = ax
⇒ p(x) = 0
⇒ ax = 0
⇒ x =
⇒ x = 0
Hence, 0 is a zero of polynomial ax
(vii) p(x) = cx + d
⇒ p(x) = 0
⇒ cx + d = 0
⇒ cx = -d
x =
Hence, is a zero of polynomial cx + d
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