Oblicz:
a*( a − 8) = 144 − ( a −8)2
musi wyjść 26
a²-8a=144-(a²-16a+64)
a²-8a=144-a²+16a-64
a²-8a-144+a²-16a+64=0
2a²-24a -80=0
Δ= 576-4*2*(-80)=576-8*(-80)=576+640=1216
√Δ= 2√(304)=4√(76)=8√(19)
a1=(24-8√(19))/4=6-2√(19)
a2=(24+8√(19))/4=6+2√(19)
ja nie wiem skad ci sie wzielo 26
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a*( a − 8) = 144 − ( a −8)2
a²-8a=144-(a²-16a+64)
a²-8a=144-a²+16a-64
a²-8a-144+a²-16a+64=0
2a²-24a -80=0
Δ= 576-4*2*(-80)=576-8*(-80)=576+640=1216
√Δ= 2√(304)=4√(76)=8√(19)
a1=(24-8√(19))/4=6-2√(19)
a2=(24+8√(19))/4=6+2√(19)
ja nie wiem skad ci sie wzielo 26