Airforce X Y / Indian Navy SSR Exam > Airforce X Y / Indian Navy SSR Questions > Ifx = 3is a root of the polynomial,f(x) = 4x3...
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If x = 3 is a root of the polynomial, f(x) = 4x3+2x2+5x−a. Find the value of x.
- a)123
- b)141
- c)136
- d)189
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Ifx = 3is a root of the polynomial,f(x) = 4x3+2x2+5x−a. Find the...
Given:
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
Most Upvoted Answer
Ifx = 3is a root of the polynomial,f(x) = 4x3+2x2+5x−a. Find the...
Given:
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
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Community Answer
Ifx = 3is a root of the polynomial,f(x) = 4x3+2x2+5x−a. Find the...
Given:
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
f(x) = 4x3+2x2+5x−a
and x = 3
When we put the value of root in the polynomial, then the value of the polynomial is equal to zero.
F(3) = 4(3)3 + 2(3)2 + 5(3) − a
⇒ 0 = 108 + 18 + 15 − a
⇒ 0 = 141 − a
⇒ a = 141
∴ Value of a is 141.
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Ifx = 3is a root of the polynomial,f(x) = 4x3+2x2+5x−a. Find the value ofx.a)123b)141c)136d)189Correct answer is option 'B'. Can you explain this answer?
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