Question

como resolver essas contas por bhaskara??
X²-7X-42=0
E
X²-3X-26=O
POR BHASKARA

Answer 1

x²-7x-42=0
∆=b²-4.a.c
∆= (-7)²-4.1.(-42)
∆=√217
X= -b±√∆/2.a
x'= 7+14,7/2
x'= 21,73/2

x"= 7-14,7/2
x"= - 7,7/2

x²-3x-26=O
∆=b²-4.a.c
∆= (-3)²-4.1.(-26)
∆= √113

X= -b±√∆/2.a
x'= 3+10,63/2
x'= 13,63/2

x"= 3-10,63/2
x"= -7,63/2