Factorise: xsquare-ysquare- 2x - 4y +1 - 4. ans (x+y+1)(x - y - 3) how

1.	Factorise: xsquare-ysquare- 2x - 4y +1 - 4. ans (x+y+1)(x - y - 3) how??
Answer» This question uses formula. $x=\dfrac{-b\pm\sqrt{b^2-4ac} }{2a}$ , GOOD. With this, we can FIND two roots. Furthermore, we can use factor theorem. Let's find the solutions for x. We should SOLVE for x. → $x^2-2x-y^2-4y-3=0$ Apply formula, we get the two roots. → $x=\dfrac{2\pm\sqrt{4y^2+16y+16} }{2}$ → $x=\dfrac{2\pm{2(y+2)} }{2}$ → $x=1\pm(y+2)$ ∴The two solutions are $x=y+3$ or $x=-y-1$ . By factor theorem, two factors are $x-y-3$ and $x+y+1$ . ∴ $(x-y-3)(x+y+1)$ Be brainly! TRY to UNDERSTAND math, it can solve the problem more easily.