what is a minus b minus C minus d whole square
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3
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formula a² -b²- c² +2(ab+ bc+ca)
(-b-c-d)²=
b²+c²+d²+2(bc+cd+bd)
b²+c²+d²+2bc+2cd+2bd
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2
Answer:
it is very simple to find out
(a - b - c - d)
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