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a+b=34
b=34-a
a=x
b=34-x
P=ab
P=x(34-x)
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-x²+34x=240 /*(-1)
x²-34+240=0
Δ=b²-4ac
Δ=1156 -960=196
√Δ=14
x1=(-b+√Δ)/(2a)=(34+14)/2 =48/2 =24
x2=(-b-√Δ)/(2a) =(34-14)/2 =10
a=24
b=10