3x2 + 30x + 48 is a quadratic polynomial.
If 3x2 + 30x + 48 = 0, then:
3(x + 2)(x + 8) = 0
⇒ x + 2 = 0 → x = -2
or x + 8 = 0 → x = -8
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With difficulty because it's not an equation but an expression.
31x
I guess that should be 3 times (x squared) minus 48: 3x2 - 48 = 3(x2 - 16) = 3(x + 4)(x - 4)
-3x2 + 16x + 12 = -3x2 + 18x - 2x + 12 = -3x*(x - 6) - 2(x - 6) = -(3x + 2)*(x - 6)
No.