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Find the torque of a corce 7hati-3hatj-5...

Find the torque of a corce `7hati-3hatj-5hatk` about the origin which acts on a particle whose position vector is `hati+hatj-hatk`
Given: `vecF=7hati-3hatj-5hatk`

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And `vecr=hati+hatj-hatk`
Formula:
Torque `vec(tau)=vecrxxvecF|(hati, hatj, hatk),(1,1,-1),(7,-3,-5)|`
`vec(tau)=-8hati-2hatj-10hatk`
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