Question

show that 3 and -1/2 are roots of quadratic equation 2x^2-5x-3=0​

Answer 1

2(3)^2-5(3)-3

2(9)-15-3

18-18

0

therrefore 3 is zero of p(x)

let x= -1/2

2(-1/2)^2-5(-1/2)-3

2(1/4)+5/2-3

1/2+5/2-3

6/2-3

3-3

0

therefore -1/2 is zero of p(x)