Как решить y=x^2-4x+3; y=3-x

<span><span>y=x^2-4x+3
</span><span>y=x^2-4x+4-1
</span><span>y+1= (x-2)^2
</span>√ (y+1) = x - 2
x = <span>√ (y+1) + 2
обратная функция
</span>y = <span>√ (x+1) + 2</span></span>