Hi,

solve  

2x^2 + 7 = 61

2x^2 = 54

x^2 = 27

x = +- *sqrt (9*3)

x = +-3



5z^2-200 = 0

5z^2 = 200 

z^2 = 40

z = +- sqrt(4*10)

z = +-  

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