Find all the roots of `x^4 - 81 =0`

State whether B is a subset of A or not:A = the set of the real roots of x^4 -1 = 0 , B = the set of the real roots of x^2 -1=0

If alpha and beta are roots of x^2 - 6x + a = 0 and 3alpha + 2beta = 20 , find the value of a.

Find the square root of 3-4i .

Prove that if the roots of 9x^2+ 4ax + 4 = 0 are imaginary then -3 < a < 3.

Find the roots of the following quadratic equation 3x^2-4sqrt3x+4=0

Find the nature of the roots of the following quadratic equations.If the real roots exist,find them:(ii) 3x^2-4sqrt3x+4=0

Find the nature of the roots of the following quadratic equations. If the real roots exist find them. x^2+x+1=0

Find the roots of the following quadratic equations,if they exist,by the method of completing the square:(ii) 2x^2+x-4=0

Find the roots of the following quadratic equations, if they exist, by the method of completing the square: 4x^2+x-3=0

Find the roots of the following quadratic equations,if they exist,by the method of completing the square:(iv) 2x^2+x+4=0