For any value of x, 18x divided by 2 is always 9x.
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3x3+15x2+18x = 3x(x2+5x+6) = 3x(x+2)(x+3)
18x is a monomial because it only has a single x.
18x + 45 or 9(2x + 5) how is this answer figured?
It is equal to -18x^2 +9x
81. To complete the square, halve the coefficient of the x term (18/2 = 9) and add the square of this (92 = 81) to both sides: x2 + 18x = -13 ⇒ x2 + 18x + 81 = -13 + 81 ⇒ (x + 9)2 = 68