Question

AJUTATIMA VA ROG ÎMI TREBUIE URGENT PUN STELUTE SI COROANE​

Answer 1

1. A=60
2.a)x^2+3x/x^2-9=x(x+3)/(x-3)(x+3)[simplificam prin x+3]=x/x-3
x^2-9=(x-3)(x+3)
b)x^2-49/x^2+14x+49= (x-7)(x+7)/(x+7)^2[simplificam prin x+7]=x-7/x+7
x^2-49=(x-7)(x+7)
x^2+14x+49=(x+7)^2
3. x-2/5+x+1/2=3(aducem la acelasi numitor)
2(x-2)/10+5(x+1)/10=30/10 |•10
2(x-2)+5(x+1)=30
2x-4+5x+5=30
7x +1=30 |-1
7x=29 |:7
x=29/7