Question

5(x в квадрате)-45=

81-9(p вкадрате)=

Answer 1

5X^2=45

x^2=9

x1=3

x2=-3

--------- 

-9x^2=-81

x^2=9

x1=3

x2=-3 

Answer 2

5х^2-45-81+9X^2=0

(5x^2+9x^2)-(45+81)=0

14x^2-126=0

14x^2=126

x^2=126/14

x^2=9

x1=3

x2=-3