x=3
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If you subtract 15 from -6 you get -21. If you worked out the problem on paper, this is what it would look like. -6 - 15 = ? (change the minus to a plus, and change the sign of 15 from positive to negative) -6 + -15 = ? ( now you can add negative 6 plus negative 15 which equals negative 21) -6 + -15 = -21
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
X= 1.567764363, -9.567764363
(x + 1)(x - 15) gives roots of -1 and 15, and a = 14; (x + 5)(x - 3) gives roots of -5 and 3, and a = 2.
x = 15