What’s the answer to this

The value √10 and √15 are plotted on the number line

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?