2sec x+8=0

here's what i have so far:

2sec x=-8

sec x = -4

cos x = -1/4

x= arccos (-1/4)

---this is where i'm stuck---

i can get the answer in degree mode but i need it/them in radian mode and it's driving me crazy!!! thank you!

2sec x+8=0

here's what i have so far:

2sec x=-8

sec x = -4

cos x = -1/4

x= arccos (-1/4)

---this is where i'm stuck---

i can get the answer in degree mode but i need it/them in radian mode and it's driving me crazy!!! thank you!

here's what i have so far:

2sec x=-8

sec x = -4

cos x = -1/4

x= arccos (-1/4)

---this is where i'm stuck---

i can get the answer in degree mode but i need it/them in radian mode and it's driving me crazy!!! thank you!

Doesn't your calculator say how to convert to radian mode? If you lost your manual, the manufacturer's web site should have backups there, probably as a PDF.2sec x+8=0

here's what i have so far:

2sec x=-8

sec x = -4

cos x = -1/4

x= arccos (-1/4)

---this is where i'm stuck---

i can get the answer in degree mode but i need it/them in radian mode and it's driving me crazy!!! thank you!