KnowledgeBoat Logo
|

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

12 Likes

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 = 52-\dfrac{5}{2}

Hence, 52-\dfrac{5}{2} is a zero of polynomial 2x + 5

(iv) p(x) = 3x - 2

⇒ p(x) = 0

⇒ 3x - 2 = 0

⇒ 3x = 2

⇒ x = 23\dfrac{2}{3}

Hence, 23\dfrac{2}{3} is a zero of polynomial 3x - 2

(v) p(x) = 3x

⇒ p(x) = 0

⇒ 3x = 0

⇒ x = 03\dfrac{0}{3}

⇒ x = 0

Hence, 0 is a zero of polynomial 3x

(vi) p(x) = ax

⇒ p(x) = 0

⇒ ax = 0

⇒ x = 0a\dfrac{0}{a}

⇒ x = 0

Hence, 0 is a zero of polynomial ax

(vii) p(x) = cx + d

⇒ p(x) = 0

⇒ cx + d = 0

⇒ cx = -d

x = dc\dfrac{-d}{c}

Hence, dc-\dfrac{d}{c} is a zero of polynomial cx + d

Answered By

3 Likes


Related Questions