Ответы и объяснения

2012-03-29T10:40:50+04:00

 x(x-6)2+ 2(x-3)2= 81

2x^2-12x+4x-12=81

2x^2-8x-93=0 

 2x2 - 8x - 93 = 0
D = b2 - 4ac
D = 64 + 744 = 808 = (2√202)^2

x1,2 = -b ± √D/2a
x1 = 8 + 2√202/4= 4 + √202/2
x2 = 8 - 2√202/2/4 = 4 - √202/4
Ответ: x1 = 4 + √202/2
 ; x2 = 4 - √202/2