## Algebra and Trigonometry 10th Edition

$(x+3)(x-1)$
Expression : $(x+3)^{2} -4(x+3)$ Common factor : (x+3) Hence simplifying it gives : $(x+3)^{2} -4(x+3) = (x+3)(x+3 - 4)=(x+3)(x-1) = x^{2}+2x-3$