Question

Является ли число -2 корнем уравнения:-5х(в квадрате)-9х+2=0?

Answer 1

-5х(в квадрате)-9х+2=0
У(-2)=-5*(-2)(в квадрате)-9*(-2)+2=-20+18+2=0
0=0
Является

Answer 2

Checking if -2 is a Root of the Equation

To determine if -2 is a root of the equation -5x^2 - 9x + 2 = 0, we can substitute -2 for x in the equation and see if the equation holds true.

Substituting -2 for x in the equation: -5(-2)^2 - 9(-2) + 2 = 0

Solving the equation: -5(4) + 18 + 2 = 0 -20 + 18 + 2 = 0 -20 + 20 = 0 0 = 0

The equation holds true when x = -2, so -2 is a root of the equation.