Question

When we multiply 2$\le x<4$ by -4; inequation becomes ___.

• A. -8 $>-4x\ge 16$
• B. -8 $<-4x\le 16$
• C. -8$\le -4x<16$
• D. $-16<-4x\le -8$

Answer 1

The correct option is D $-16<-4x\le -8$

Given: $2\le x<4$

Rule: If both the sides of an inequation are multiplied or divided by the same negative number, then the sign of the inequality will get reversed.
On multiplying the above inequation by -4, we get

$2\le x<4$

$\Rightarrow -16<-4x\le -8$