Which of the equations below could NOT readily be solved using the square root method?
x
2
=
40
\displaystyle {x}^{{2}}={40}
x
2
=
40
5
x
2
+
3
=
40
\displaystyle {5}{x}^{{2}}+{3}={40}
5
x
2
+
3
=
40
3
(
x
−
5
)
2
=
42
\displaystyle {3}{\left({x}-{5}\right)}^{{2}}={42}
3
(
x
−
5
)
2
=
42
−
8
x
2
+
9
x
+
2
=
0
\displaystyle -{8}{x}^{{2}}+{9}{x}+{2}={0}
−
8
x
2
+
9
x
+
2
=
0
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