Question

find the value of a so that "-1" is root of 2x² - x + a = 0​

Answer 1

Answer:

a=-3

Step-by-step explanation:

Put value of x=-1

p(-1)=2×-1²-(-1)+a

=2×1+1+a

=2+1+a

=3+a

As -1 is a root of p(x),

3+a=0

a=-3 Ans.