Question

va rog ajutatima nu stiu de loc

Answer 1

A) x^2=13^2
x=13
B) 5x^2=80
x^2=16
x=4
C) 9-x^2=8
x^2=1
x=1
D) 9x^2=4
x^2=4/9
x=2/3
E) x^2+2x+1=16
x^2+2x-15=0
delta= 4+60=64
X1=(-2+8)/2=3
X2=(-2-8)/2=-5
F) 6x^2+60=60
6x^2=0
x=0