Question

calculati:
2x*3x+5x*x-3$x^{2}$*2+$x^{2}$=

Answer 1

$2x*3x+5x*x-3x^2*2+x^2= \\ =6x^2+5x^2-6x^2+x^2=(6+5-6+1)x^2=6x^2$