$25\:-\:x\:4\:=\:25\:-\:4x$
$a2\:-30+225$
$\sqrt{\left(x+4\right)\left(x+2\right)+1}$
$\left(sen\:x\:-\:2\right)\:.\:\left(2\:.\:sen\:x\:-\:\sqrt{2}\right)\:=\:0$
$\left|3-3\cdot\left(-7\right)-40\right|$
$4x^2+28x+48$
$\left(a^2+4\right)\left(a^2+8\right)$
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