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subtract the polynomials: (9x^2 - 4x + 11) (3x^2 - 2x + 2)

What number must you add to complete the square x^2+12x=16

What is the solution of sqrt x+2-15=-3

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15