Zapisz w najprostszej postaci wyrażenie (3z - 8) do kwadratu - 5 (3 + 2z) do kwadratu + (4z + 3) do kwadratu i oblicz jego wartość dla z=10
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(3z-8)² - 5(3+2z)² + (4z+3)²=
=9z²-48z+64 - 5[9+12z+4z²] + 16z²+24z+9=
=25z²-24z+71 - 45-60z-20z²=
=5z²-84z+26=
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z=10
=5*100-840+26=
=500-840+26=
=-314