6X ^ 2 + 3x-10 = 0, how to solve this equation? I know how to use cross multiplication. Please explain clearly how to use cross multiplication?

6X ^ 2 + 3x-10 = 0, how to solve this equation? I know how to use cross multiplication. Please explain clearly how to use cross multiplication?

∵ a = 6, B = 3, C = - 10 ∵ B ^ 2-4ac = 3 ^ 2-4 * 6 * (- 10) = 249 x = - 3 ± root sign, 249 cross multiplication is only applicable to integer roots, but not fractional decimals

Judgment question: the equation with unknowns is called equation () 4x + 5, 6x = 8. The solution of equation () 18x = 6 is x = 3 ()
Equation doesn't have to be equation, equation doesn't have to be equation ()

Judgment questions:
An equation with unknowns is called equation (x)
4X + 5 and 6x = 8 are equations () and the solution of 18x = 6 is x = 3 (x)
Equation is not necessarily equation, equation is not necessarily equation (x)

Is the formula with unknowns called equation correct

Equation