Question

DAU 20 PUNCTE rapid va rog

Answer 1

Bună! ⭐

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$a = -2x+ 5$

$b= x+3$

$c=3x+2$

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$a)$ $x=-1$

$a = -2*(-1) +5 = 2+ 5 = 7$

$b= - 1 +3 = 2$

$c=3*(-1)+2=-3+2=-1$

$a+b+c=7+2-1=8$

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$b) |a+b|= |c|$

$|-2x+5+x+3|= |3x+2|$

$|8-x|=|3x+2| => \left \{ {{8-x=3x+2} \atop {8-x=-3x-2}} \right.$

$^{ ( 1) }$ $8-x=3x+2 <= > -4x= -6 => x_{1} = \frac{3}{2}$

$^{(2)}$ $9-x=-3x-2 <=> 2x=-10 => x_{2} =-5$

$x$ $nu mar$ $intreg$ $=>$ $x=-5$