if $\alpha ,\beta $are the roots of $ a{x^2} + bx + c = 0$ and${\alpha ^4},{\beta ^4}$ are the roots of $l{x^2} + mx + n = 0$ then " equation ${a^2}l{x^2} - 4aclx + 2{c^2}l + {a^2}m = 0$ are always real and opposite in sign ." statement is ?
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