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1.234²+0.766²+2.468×0.766-3.35²+0.75²

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1.234²+0.766²+2.468×0.766-3.35²+0.75²
1.234²+0.766²+2.468×0.766-3.35²+0.75²
1.234²+0.766²+2.468×0.766-3.35²+0.75²
=1.234²+0.766²+2x1.234×0.766-3.35²+0.75²
=(1.234+0.766)^2+0.75²-3.35²
=4+(0.75+3.35)(0.75-3.35)
=4+4x(-2.6)
=-4*1.6
=-6.4
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