Question

Îmi desface cineva parantezele??(x-1)(x+2)??

Answer 1

$(x-1)(x+2)= x^{2} +2x-x-2= x^{2} +x-2$
[tex] x^{2} +x-2=226,8\\ x^{2} +x-2-226,8=0\\ x^{2} +x-224,8=0\\ \Delta= b^{2} -4*a*c=1-4*1*(-224,8)=1+899,2=900,2 \\ x_{1}=\frac{-b-\sqrt{\Delta}}{2a}= \frac{-1-\sqrt{900,2}}{2} \\ x_{2}=\frac{-b+\sqrt{\Delta}}{2a}= \frac{-1+\sqrt{900,2}}{2} [/tex]

Answer 2

(x-1)(x+2) = xla2 + 2x -1x -2