1.(x+5)^2+(x-2)^2+(x-7)(x+7)=11x+
2.(x-4)(4x-3)+3=0
3.(3x-1)(x+2)=20
Помогите плииз))
2.(x-4)(4x-3)+3=0
3.(3x-1)(x+2)=20
Помогите плииз))
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Answers & Comments
4x^2-19x+15=0
D=361-240=121=11^2
x=(19⁺₋11)/8
x1=(19+11)/8=30/8=3.75
x2=(19-11)/8=8/8=1
3)3x^2+6x-x-2=20
3x2+6x-x-2-20=0
3x2+5x-22=0
D=25+4*3*22=25+264=289=17^2
x1=(-5-17)/6=-22
x2= (-5+17)/6=12/6=2