Question

Aflati nr x si y stiind ca (x-3)(x+4)=12

Answer 1

Desfacem parantezele:
=>x²+4x-3x-12=12
=>x²+x-24=0
Si aici avem o ecuatie de gradul II.
y,nu este specificat in ecuatie,deci daca asta este,atunci voi afla in continuare x1,respectiv x2,folosind algoritmul de rezolvare.

Δ=b²-4ac=1+24=25

x1=(-b+√Δ)/2a=(-1+√25)/2=(-1+5)/2=4/2=2
x2=(-b-√Δ)/2a=(-1-√25)/2=(-1-5)/2=-6/2=-3

Deci S(2;-3)