9x^2+24x+16=4(x-1)^2 9x^2+24x+16=4(x^2-2x+1) 9x^2+24x+16=4x^2-8x+4 9x^2+24x+16-4x^2+8x-4=0 5x^2+32x+12=0 (5x+2)(x+6)=0 x1=-2/5,x2=-6
