Tallzz's posts

Tallzz
replied to Official quant thread for CAT 2010 (part2)

(a2+b2+c2)^2 = (a4+b4+c4+2(a2b2+b2c2+a2c2))

so, a4+b4+c4 = 25 - 2(a2b2+b2c2+a2c2)

now, ab+bc+ca = 2(find out),

so, (ab+bc+c)^2 = (a2b2+b2c2+a2c2+2(abc(a+b+c))=(a2b2+b2c2+a2c2 + 6abc)

so, (a2b2+b2c2+a2c2) = 4-6abc

we hav to find 6abc,

(a2+b2+c2)(a+b+c)=a3+b3+c3+(ab2+a2b+b2c+bc2+...

so, a4+b4+c4 = 25 - 2(a2b2+b2c2+a2c2)

now, ab+bc+ca = 2(find out),

so, (ab+bc+c)^2 = (a2b2+b2c2+a2c2+2(abc(a+b+c))=(a2b2+b2c2+a2c2 + 6abc)

so, (a2b2+b2c2+a2c2) = 4-6abc

we hav to find 6abc,

(a2+b2+c2)(a+b+c)=a3+b3+c3+(ab2+a2b+b2c+bc2+...

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