(4x^-3 y^5 z^-2)(2^-1 x^-1 y^-2)

Subtract 8 1/6 - 4 5/6 . simplify the answer and write as a mixed number.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0