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2013-01-22T09:03:16+00:00

2) пусть 2z^2 +11z = a

a^2 - 23a +126=0

a = 9   a = 14

2z^2 +11z = 9

2z^2 +11z-9 = 0

z = -4,5     z = 1

 

2z^2 +11z = 14

2z^2 +11z - 14 =0

z = -3.5     z   =-2

 

3) x^2 -4x = a

(a+1) (a+2) =12

a^2 +3a +2 = 12

a^2 +3a -10 = 0

a = 2     a= - 5

x^2 -4x = 2

x^2 -4x -2 =0

 

x^2 -4x = -5

x^2 -4x + = 0