I guess that should be 3 times (x squared) minus 48:
3x2 - 48 = 3(x2 - 16)
= 3(x + 4)(x - 4)
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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
Make it easier, divide by 3: 3(x2 - 8x - 16) This is as far as it goes. (Quadratic formula gives roots as 9.66 and -1.66)
The answer is 12. Four times 12 equals 48 (4 × 12 = 48).
± 2.632148 to the fourth power equals 48.
5.6 times 48 equals 268.8