Solve the following questions :
If the value of the polynomial `x^3 + 3x + a` for `x = 2` is 9 , then find the value of a .

Solve the following questions : Find the degree of the polynomial ( x^2y + 1 )^2 .

Find the value of the polynomial p (x) = 2x^2 - 3x + 5 for x = 2 .

For x=0, find the value of the polynomial x^2-5x+5

Solve the following equations: x^2 +3 x +9 = 0

Find the value of the polynomial p(x) = 2x^(2) - 3x + 5 for x =2 .

Solve the following questions : If the remainder obtained by dividing 5x^2 + mx + 15 by ( x - 5 ) is 90 , then find the value of m .

If the value of the polynomial x^4 + 2x^3 - 3x^2 + mx -1 is 21 when x = 2 , then find m .

If 3x+5y=9,5x+3y=7 then find the value of x-y .