Question 323144
A good fact to keep in mind is
{{{a/(-b) = -a/b}}}
{{{(-a)/b = -a/b}}}, so
{{{6/(-5) = -6/5}}}
{{{(-6/5)*(-3/4)*(-2)}}}
Notice the general form (-) x (-) x (-)
(-) x (-) = (+), so you have
(+) x (-) = (-)
That takes care of your signs, and you have
{{{(-6/5)*(-3/4)*(-2) = -(6/5 * 3/4 * 2)}}}
{{{ -(6/5 * 3/4 * 2) = -36/20}}}
{{{-36/20 = -9/5}}}
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{{{(1 - 2^3)^2 - 4*(-5)}}}
A helpful rule is "whenever possible, work from the inside out"
{{{(1 - 2^3)^2 - 4*(-5) = (1 - 8)^2 - 4*(-5)}}}
{{{(-7)^2 - 4*(-5) = 49 - 4*(-5)}}}
{{{49 - (-20) = 49 + 20}}}
{{{49 + 20 = 69}}}
I just used the rule
{{{-a*(-b) = ab}}}