Question

Find a and b.If 20 < 5x< 30, then a< x2

Answer 1

20 < 5x < 30

divide all sides by 5

So,

20/5 < x < 30/5

4 < x < 6

Square the all sides

so,

[tex]4^216 < x^2 < 36

So,

Compare to a < x2 < b

So,

a = 16 and