Polynomials Test

Result

Polynomials Test - 10

Score
-
out of -
Rank
-
out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

If x-1 if the factor of p(x)= x³− 23x²+ kx−120, then the value of ‘k’ is

A
140

B
142

C
120

D
124

Solution

If x - 1is a factor of p(x), then

p(1) = 0

(1)³ - 23 (1)² + k (1) - 120 = 0

1 - 23 + k - 120 = 0

1 - 143 + k = 0

-142 + k = 0

k = 142
Question 2
1 / -0

If f(x) = x²−5x + 1, then the value of f(2) + f(-1) is

A
-2

B
2

C
-1

D
1

Solution

f(x) = x²− 5x+1

f(2) + f(−1)

= (2)²−5×2+1+(−1)²−5×(−1)+1

= 4−10+1+1+5+1

= 12−10

= 2