(√x-1)(x²+14x-15)=0
√x-1=0
√x=1
x=1
x²+14x-15=0
D=b²-4ac=196-4*1*(-15)=256; √D=16;-16.
X1=(-14+16)/2=1
X2=(-14-16)/2=-15
Ответ: 1 и 1;-15
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(√x-1)(x²+14x-15)=0
√x-1=0
√x=1
x=1
x²+14x-15=0
D=b²-4ac=196-4*1*(-15)=256; √D=16;-16.
X1=(-14+16)/2=1
X2=(-14-16)/2=-15
Ответ: 1 и 1;-15