JE RÉVISE

Question

2) Développe, réduis et ordonne\((x +\frac{b}{2a})^{2} - \frac{b^{2}-4ac}{4a^{2}}\).

3) Factorise\( (x+1)^{2}- 25\)

Solution

2) \((x +\frac{b}{2a})^{2} - \frac{b^{2}-4ac}{4a^{2}}\) = \(x^{2}+\frac{b}{a} x+\frac{c}{a}\)

3) \((x+1)^{2} - 25\) = \((x+1-5)(x+1+5)\) = \((x-4)(x+6)\)