Question

Vreau doar rezolvarea punctelor b, c si d (exercițiul 11)

Answer 1

b) (x+1)(x+2)=56
x^2+2x+x+2=56
x^2+3x+2=56

delta= b^2-4ac
delta=3^2-4*2
delta= 9-8=1
x1,x2= -b+sau -rad delta/2a
x1= -3+1/2 = -1
x2= -3 -1 /2 = -2

(x :50 + 30) :6 - 6 = 0
( x:50+30) :6=6
(x:50+30)=36
x:50=6
x=300