Question 1136757

this factors into an x^2-  and an x^2- because the middle term is negative and last term is positive.  One can use a u substitution where u=x^2

(u-10)(u+3)=0 The given is an expression, the equal sign 0 makes it an equation.
u=10 and -3
x^2=10
x+=/- sqrt (10) or (-sqrt(10), + sqrt (10)) ANSWER.  
The other two solutions are complex/imaginary