Pls answer only 16 and 19

Question 16:

and are the roots of the equation.

That means

So,

Compare coefficient

Consider

Ans: 8/5

Question 19:

Substitute x with -1

So,

Ans: -6

ab: 2 n83b8eb7ebi. 8e yen in

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b