Question

AJUTORRRRRR 14!!!!!!!!

Answer 1

a,  Δ= 49 +120 =169 
x₁ = (7 + 13 ) /4 = 5                           x ₂= ( 7 -13 ) /4 = - 6/4 = -2/3
b. Δ = 49 - 40 = 9 
x₁ = ( 7 -3 ) / 4 =1                             x ₂= ( 7 + 3 ) /4 = 1
c.Δ= 1 + 48 =49 
x₁ = ( 1  -7 ) /12 =  - 6/12 = -1/2          x ₂= ( 1 + 7) /12 = 8 /12 = 2 /3 
d.   Δ= 25 + 96=121
x₁ = ( 5 +11 ) /12 = 16 /12 = 4/3          x₂ = ( 5 -11 ) /12 = -6 /12 = - 1/2

Answer 2

Folosind formulele : 
Δ = b² - 4ac
$x_{1}$ = $\frac{-b+ \sqrt{delta} }{2a}$
$x_{2}$ = $\frac{-b- \sqrt{delta} }{2a}$