х-5(х-3), х=8
1) х-5(х-3)=(8-5)(8-3)=3×5=15
или
2) (х-5)(х-3)=х^2-3х-5х+15=х^2-8х+15=8^2-8×8+15=64-64+15=0+15=15
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х-5(х-3), х=8
1) х-5(х-3)=(8-5)(8-3)=3×5=15
или
2) (х-5)(х-3)=х^2-3х-5х+15=х^2-8х+15=8^2-8×8+15=64-64+15=0+15=15