Question

como resolver 2x2 - 7x = 15
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Answer 1

2x² — 7x =15

2x² —7x — 15 = 0

a = 2 ; b = —7 c = —15

∆=b²—4.a.c

∆ = (—7)²—4.2.(—15)

∆ = 49 + 60

∆ = 109

x'e" = (—b±√∆)/2.a

x'e" = (7±√109)/2.2

x'e" = (7±√109)/4