Question 269160
{{{-4*(-5)*(-4)*(-7)}}}
to make this easy count how many negative"-" signs you have in the multiplication problem. Odd amount(1,3,5,7,9...) will always give u a negative number and and even amount (2,4,6,8...)will always give u a possitive number.
so from the problem there are 4 negative signs so you know the answer will be possitive.
so then u can rewrite the problem as {{{4*5*4*7}}}
now simply multiply in order
{{{4*5=20}}}
{{{20*4=80}}}
{{{80*7=560}}}
so 560 is the answer