1)
5a²+19a-4=0
D = 19²-4*5*(-4) = 361+80 = 441 = 21²
2) x²-8x+7=0
D = (-8)²-4*1*7=64-28=36=6²
Ответ: 1
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1)
5a²+19a-4=0
D = 19²-4*5*(-4) = 361+80 = 441 = 21²
2) x²-8x+7=0
D = (-8)²-4*1*7=64-28=36=6²
Ответ: 1