Question

2x^2 -7= 74 please show all work

Answer 1

`2x^2-7=74\\ 2x^2=81\\ x^2=(81)/(2)\\ x=-\sqrt{(81)/(2)} \vee x=\sqrt{(81)/(2)}\\ x=-(9)/(\sqrt2) \vee x=(9)/(\sqrt2)}\\ x=-(9\sqrt2)/(2) \vee x=(9\sqrt2)/(2)}\\`