Find if (-2x-5) is a factor of the polynomial p(x) = 3x 4 + 5x 3 - 2x 2 - 4 or not.
Answers
Answered by
22
just put the value for 10 in place of x in the given polynomial to check
Answered by
54
Given factor -2x-5
== x= -5/2
Put this value in given equation
p(x) = 3x 4 + 5x 3 - 2x 2 - 4
== 3{(-5/2)^4}+{5(-5/2)^3}-{2(-5/2)^2}-4
== 3(625/16)+5(-125/8)-2(25/4)-4
== taking LCM 16
== 3(625)-5(125)2-2(25)4-4(16)/16
== 1875-1250-200-64/16
== 361/16
Bcz answer of equation is not zero hence -2x-5 is not a factor of given polynomial
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