М(-28,-60) ? Если так, то...
2х-у=4
2*(-28)-(-60)=4
-56+60=4
4=4
Лежит.
(b+8)^2-4b^2=(b+8-2b)•(b+8+2b)=(-b+8)•(3b+8)
2sin^2x-(1-sin^2x)-1=0
2sin^2x-1+sin^2x-1=0
3sin^2x-2=0
3sin^2x=2
sin^2x=2/3
sinx=2/3
x=(-1)^k•arcsin(2/3)+пn
sinx=(-2/3)
x=(-1)^k+1•arcsin(2/3)+пn
<span><span><span><span><span><span>7</span><span>(</span><span>−</span><span>3</span><span>−</span><span>x</span><span>)</span><span>></span><span>−</span><span>5</span></span></span></span></span></span><span>.</span>
<span>-21-7х>-5</span>
<span>-7x>16</span>
<span>x<16/-7</span>
<span>x<-2.2/7</span>
Самое наибольшее равно -3
Ответ:-3