Question

can someone help me solve this

2sin^2x + sinx-1 =0

Answer 1

Treat it like a quadratic equation.

Answer 2

Do you know what I mean by that, @0213 ?

Answer 3

yes, i solved it, i got (2sinx-1)(sinx+1), then the answer for (2sinx-1) are 30 deg, and 150 deg, but i don't know how to get the answer for (sinx+1) since it solves to 270 deg (that is what the back of my book says it is).

Answer 4

If sin(x)+1=0 then sin(x)=-1, that occurs at 270º

Answer 5

oh, i get it. because on the graph of sin, at y=-1, x= 270.

thank you

Answer 6

No prob'

Answer 7

could you help me with another question?

Answer 8

Post it as a new question and I'll get to it when I can.