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2xla a doua + 7 x-8=0​

Răspuns :

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

----------- = ---------------- = ---------------

2a 2×2 4