3(x+5)=7-x3x+15=7-x4x=-8x=-2
-19.6 m/s
Do you need the math as well?

let's factorise :
now, there are two cases :
case 1 :
case 2 :
Quadratic in equality is quadratic function that is compared to another function like: x^2+4x-1<2x-3. the answer for x must comply to both sides.