Respuesta :

distributive property
a(b+c)=ab+ac

x(x+1)=x(x)+x(1)=x^2+x=x^2+x
true statement
You have to distribute first so...

X(X + 1) distributed would be..

X・X = x^2

X・1 = X

And then you put them back together which would give you...

X^2 + X which is obviously = to X^2 + X

So...

X^2 + X = X^2 + X

Is a true statement