Resposta:

12x²-7x=10

12x²-7x-10=0

∆=b²-4.a.c

∆=(-7)²-4×12×(-10)

∆= 49+480

∆=529

X= -(-7)± √529 \ 2×12

X= 7± 23 \24

X'= 7+23 \ 24 = 5\4

X"= 7-23 \ 24 = -2\3