Question

बहुपद x² – 2x –15 का एक शून्यक है -
(A) x = –5 (B) x = –3
(C) x =0 (D) x =3

Answer 1

Answer:

According to question

x^2 -2x-15

x^2-3x+5x-15

x (x-3)+5 (x-3)

(x+5) , (x-3)

now

x+5=0............1 equation

x= - 5

but

x-3=0

x=3 ..............2 equation

so correct is (d) answer x=3

because

negative digit neglected