Ify=ax^3+bx^2+cx+5 touches the X axis at (-2,0), touches Y axis at a point where its gradient is 3. find a,b,c

if the curve y=ax^3+bx^2+cx+5 touches the X - axis at the point P(-2,0), and cuts the Y-axis at a point Q where its gradient is 3, find a,b,c