1. 2x+2=6 , x=-2
2(-2)+2=6
-4+2=6
-2≠6 , FALSE
2. b³-2=25 , b=-3
-3³-2=25
-27-2=25
-29≠25 , FALSE
3. 2y²-6y²=-4y² , y= IR
-4y²=-4y² , TRUE
4. (2x+10)+(x-3) = 3x+7 , x=IR
2x+x+10-3 = 3x+7
3x+7 = 3x+7 , TRUE
5. (a³-za)-(a³-4a)=-6a , a=IR
a³-za + (-a³+4a)=-6a
a³-a³-za+4a=6a
0 +3a = 6a
3a ≠ 6a , FALSE
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Answers & Comments
SOLUTION
1. 2x+2=6 , x=-2
2(-2)+2=6
-4+2=6
-2≠6 , FALSE
2. b³-2=25 , b=-3
-3³-2=25
-27-2=25
-29≠25 , FALSE
3. 2y²-6y²=-4y² , y= IR
-4y²=-4y² , TRUE
4. (2x+10)+(x-3) = 3x+7 , x=IR
2x+x+10-3 = 3x+7
3x+7 = 3x+7 , TRUE
5. (a³-za)-(a³-4a)=-6a , a=IR
a³-za + (-a³+4a)=-6a
a³-a³-za+4a=6a
0 +3a = 6a
3a ≠ 6a , FALSE
ANSWER
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