Question

need a quadratic equation for solution -8 & -5=0

Answer 1

(x+8)(x+5)

Answer 2

and now expand to get
x^2 + 13x + 40

Answer 3

does that help?

Answer 4

yes, ty

Answer 5

dear sweety ! but in case the quadratic equations you need to knowing again that when you have two solutions x_1 and x_2 you can rewriting this equation what have those two solutions using this property :
-b
x_1 + x_2 = ---
a
c
(x_1)(x_2) = ---
a

- and from this you can calculate the a , b and c --- so and because you know that the basic form of quadratic equation is ax*2 + bx +c=0 , so hence you can rewrite this equation easy and exactly

hope that you will can understanding clearly