3x3 - 24x2 + 45x = 3x*(x2 - 8x + 15) = 3x*(x - 3)*(x - 5)
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3x3-18x2+24x=3x(x2-6x+8)=3x(x-4)(x-2)
Start by looking for a common factor. Separate this factor, then factor the remaining polynomial.
-3x3 - 6x2 + 189x = -3x(x2 + 2x - 63) = -3x(x + 9)(x - 7)
x - 2 = 0 if x = 2 So put x = 2 into 3x3 - 2x + 2 ie 24 - 4 + 2 = 22
3 to the 2nd power or 32