tentukan himpunan penyelesain dari 15 + 7x - 2x^2 = 0

15 + 7x - 2x^2 = 0
- 2x^2 +7x+ 15 = 0
-1× ( 2x^2 -7x- 15) = 0
-1× ( 2x^2 -10x+3x-15) =0
-1×( 2x(x-5)+3(x-5)
-1× (2x+3)(x-5)
(-2x-3)( x-5)=0
=>(-2x-3)
=> x= 3/-2

( x-5)=0
=> x= 5
Hp = { 5 dan -(3/2)}