Răspuns:
2x²+7x-8=0
∆= b²-4ac= 7²-4×2×(-8)=49+64=113
x¹= -b-√∆ - 7- √113 -7-√113
-----------= ---------------- = -------------
2a 2×2 4
x²= -b+√∆ -7+√113 -7+√113
----------- = ---------------- = ---------------
