Answer:

2. First x= -3, second x=5

3. First x= -2, second x= ⅓

Step-by-step method:

2. x²-2x-15=0

you can use factoring:

(x+3)(x-5)=0

then change the signs.

x=-3

x=-5

3. 3x²+5x-2=0

(x+2)(3x-1)=0

x+2=0

3x-1=0

x= -2

x= ⅓