First you put (x+5) into the initial function wherever you see x so it becomes (x+5)^2+3(x+5)-10=x^2+kx+30 (x^2+5x+25)+(3x+15)-10 simplified left side x^2+8x+30 fully simplified left side thus k=8 x^2+8x+30=0 to find 0s -4 + 3.7416573867739i <span>-4 - 3.7416573867739i </span>these are the roots you find after using the quadratic formula the second one is the smallest
