Question

PLS TELL ME FAST If a2+b2+c2 = 29 and ab – bc – ca = -2, find a + b – c.

Answer 1

Answer:

We know the formulae that:

(a+b-c)^2=a2+b2+c2+2(ab-bc-ca)

(a + b – c)^2=29+2*-2

(a + b – c)^2=29-4

(a + b – c)^2= -25

therefore  a+b-c=root of 25

which is 5

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Answer 2

Answer:

please refer to the attachment

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