This is an expression and you do not solve an expression, but you can factor this one.
X2 + 3X4
X2(1 + 3X2)
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3x4 plus 5x3 plus x2 - 5 divided by x 2 =[(3x4) + (5x3) + (x2 - 5)]/x2 =(12 + 15 + x2 -5)/x2 =(27 - 5 + x2)/x2 =(22 + x2)/x2
-7.5?
x^5+2x^4+4x^2+2x-3
3x2(x2 - 3)
(2x)ysquared