Question

show that 1,1/2 and -2 are zeroes of polynomial 2 X square + x square - 5 x + 2​

Answer 1

Put x = 1, 1/2, -2 in the equation

1. 2*(1)^2 + (1)^2 - 5(1) + 2

= 2 + 1 + 2 - 5

= 0

Thus, it is a zero

2. 2*(1/2)^2 + (1/2)^2 - 5*1/2 + 2

= 1/2 + 1/4 - 5/2 + 2

= 2 + 1 - 10 + 8/4

= 1/4

This isn't a zero

2*(-2)^2 + (-2)^2 - 5 * -2 + 2

= 8 + 4 + 10 + 2

= 24

If my calculations are correct then 1 is a zero while 1/2 and -2 are not :/ can you double check the question?