Question

Va rog e urgent:
(x+3)(x-7)=0
Multumesc.

Answer 1

(x+3)(x-7)=0
x+3=0
x=0-3
x=-3

x-7=0
x=0+7
x=7

Answer 2

$x^{2}$-7x+3x-21=0
$x^{2}$-4x-21=0
a=1
b=-4
c=-21
Δ=$b^{2}$-4ac
Δ=16+84=100
x1=(-b+√Δ)/2a
x1=(4+10)/2=7
x2=-6/2=-3