(xˇ2-1)ˇ2 + (xˇ2-6x-7)ˇ2=0
(x+1)ˇ2.(x-1)ˇ2+(x-7)ˇ2.(x+1)ˇ2=0
(x+1)ˇ2 ( (x-1)ˇ2 + (x-7)ˇ2)=0
<span>a)(x+1)ˇ2 =0, x+1=0, x=-1</span>
<span>y=-0,5x^2+2,5 и y=2x^2+x
0.5x</span>²+2.5=2x²+x
1.5x²+x-2.5=0 3x²+2x-5=0 √D=√4+60=8
x1=1/6[-2-8] = -10/6=-5/3 x2=1/6[-2+8] =1
A - 1-ое число
b - 2-ое число
a+b=85
a-b=15
a=15+b
15+b+b=85
2b=85-15
2b=70
b=35
a=15+35
a=50
Ответ: числа 50 и 35.
2а(х+у)+(х+у)=(х+у)(2а+1)