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MissWeasel
@MissWeasel
July 2022
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Разложите многочлен на множители, используя метод выделения полного кводрата двучлена:
а)[tex] x^{2} [/tex]-10х+20
б)[tex] y^{2} [/tex]-14[tex] y^{2} [/tex]+40
в)[tex] b^{4} [/tex] +4[tex] b^{2} [/tex]-5
г)[tex] a^{2} [/tex]-6а+5
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ahta
А)x²-10x+20=x²-2*5*x+25-25+20=(x-5)²-5=((x-5)-√5)((x-5)+√5)
б)y²-14y+40=y²-2*7*y+49-49+40=(y-7)²-9=(y-7-3)(y-7+3)=(y-10)(y-4)
в)b^4+4b²-5=(b²)²+2*b²*2+4-4-5=(b²+2)²-9=(b²+2-3)(b²+2+3)=(b²-1)(b²+5)
г)a²-6a+5=a²-2*a*3+9-9+5=(a-3)²-4=(a-3-2)(a-3+2)=(a-5)(a-1)
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Answers & Comments
б)y²-14y+40=y²-2*7*y+49-49+40=(y-7)²-9=(y-7-3)(y-7+3)=(y-10)(y-4)
в)b^4+4b²-5=(b²)²+2*b²*2+4-4-5=(b²+2)²-9=(b²+2-3)(b²+2+3)=(b²-1)(b²+5)
г)a²-6a+5=a²-2*a*3+9-9+5=(a-3)²-4=(a-3-2)(a-3+2)=(a-5)(a-1)