Plz help me with these two questions! Plz!

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?

How do i multiply two digit numbers

What is the slope-intercept from of the equation y+5=4(x+8)?