Please help me Solve: -2n > 8?
回答 (7)
2010-04-28 2:55 pm
✔ 最佳答案
-2n > 8-2n/(-2) < 8/(-2)
n < -4
2010-04-28 10:00 pm
the point of the question is you want to know what values can n take to make the above statement true?
the trick to this question is remembering that when yu divide an inequality by a negative number the inequality sign changes direction!
what does -2n have to be divided by to get n? the answer is of course -2.
this gives n>-4. but remembering the rule about dividing inequalities by negative numbers?? so instead the answer is n<-4. this means that 'n has to be smaller than -4, in order for the equation -2n>8 to be true'
the trick to this question is remembering that when yu divide an inequality by a negative number the inequality sign changes direction!
what does -2n have to be divided by to get n? the answer is of course -2.
this gives n>-4. but remembering the rule about dividing inequalities by negative numbers?? so instead the answer is n<-4. this means that 'n has to be smaller than -4, in order for the equation -2n>8 to be true'
2010-04-28 10:00 pm
divide each side by -2, remember when you divide by each side by a negative you need to change the direction of the inequality symbol. Therefore,
n<-4 --------> notice the symbol is in the opposite direction
note: the same rule holds for multiplication, but NOT for addition and subtraction.
n<-4 --------> notice the symbol is in the opposite direction
note: the same rule holds for multiplication, but NOT for addition and subtraction.
2010-04-28 9:58 pm
-2n>8
-2n/-2<8/-2
n<-4
-2n/-2<8/-2
n<-4
2010-04-28 9:58 pm
-2n > 8
n < -4
n < -4
2010-04-28 9:56 pm
to get n by itself, divide by the -2. The thing to remember is that when you divide by a negative, you need to flip the greater than sign to a less than sign.
so when you do this you get
n<(8/-2)
or n < -4
I hope this helped
so when you do this you get
n<(8/-2)
or n < -4
I hope this helped
2010-04-28 9:56 pm
Divide both sides by-2
Answer; n is less than-4
the inequality is reversed when you divide by a negative number
Answer; n is less than-4
the inequality is reversed when you divide by a negative number
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