Answer:
13, 2x^2 - 98 = 0 ........ given
2x^2= 98 ........ take to tge left side no.98
x^2 = 98/2 = 49 ..... multiple both side by radical
x = √49 = 7 ........ simplify
17, 4x^2 + 10 = 11
4x^2 + 10 = 11 4x^2 = 11- 10 = 1
4x^2 + 10 = 11 4x^2 = 11- 10 = 1 x^2 = 1/4
4x^2 + 10 = 11 4x^2 = 11- 10 = 1 x^2 = 1/4 x = √1/4 = 1/2