4z+1=0⇒4z=-1⇒z=-1/4
8z-7=0⇒8z=7⇒z=7/8
9z-17=0⇒9z=17⇒z=-17/9
5Y = 5Y
( 4X + 1)^2 = ( X + 4)^2
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16X^2 + 8X + 1 = X^2 + 8X + 16
16X^2 - X^2 + 8X - 8X = 16 - 1
15X^2 = 15
X^2 = 1
X1 = 1
X2 = - 1
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5Y = X^2 + 8X + 16
5Y = 1 + 8 + 16 = 25
Y1 = 5
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5Y = 1 - 8 + 16 = 9
Y2= 9/5 = 1,8
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Ответ ( 1 ; 5 ) ; ( - 1 ; 1,8 )
(х³ + 2х²) +( - х - 2) = 0
х²(х + 2) - ( х + 2) = 0
(х + 2)( х² - 1) = 0
х + 2 = 0 или х² -1 = 0
х = -2 х² = 1
<span> х = +- 1 </span>