Question

Calcule x.
5x² + 70x + 245 = 0
x =

Answer 1

5x^2 + 70x + 245=0
Delta= b^2.a.c
Delta= 70^2.5.245
Delta= 4900.1225
Delta= 6002500

X= -b +- _/Delta : 2a

X^1= -70 -_/6002500 : 2.5
X^1= -70 -2450 :10
X^1= -2520 : 10
X^1= -252


X^2= -70 +_/6002500 : 2.5
X^2= -70 +2450 : 10
X^2= 2380 : 10
X^2= 238