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Sagot :
It is read as a minus b minus c whole square. The (a - b - c)2 formula is expressed as (a - b - c)2 = a2 + b2 + c2 - 2ab + 2bc - 2ca.
We know
- (ab)^m=a^mb^m
Now
[tex]\\ \sf\longmapsto (-abc)^2[/tex]
[tex]\\ \sf\longmapsto (-abc)(-abc)[/tex]
[tex]\\ \sf\longmapsto (-a)^2(b)^2(c)^2[/tex]
[tex]\\ \sf\longmapsto a^2+b^2+c^2[/tex]
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