solve , `2x^2+5x- 12 =0`

Explanation

`2x^2 +5x-12=0`
x=`x=-b+sqrt(b^2-4ac)/(2a)`,a=2,b=5,c=-12
`x=-5+-sqrt(5^2-4xx2xx(-2))/(2a)``x=(-5+-sqrt(25+96))/(2xx2)`
`x=(-5+-sqrt121)/4=-(5+-11)/4`
x=3/2,-4.