Hey there, Guest!

We can go minus both sides of the expression by 20 and obtain the following,

\(5x²+19x−4>05x²+19x−4>0\)

\((5x−1)(x+4)>0(5x−1)(x+4)>0\)

For the values that are not satisfied, we can take all the values between 1/5 and -4.

Values of x that are not satisfied =\([x:−4

which means that the answer to our problem is

\(x=[0,−1,−2,−3].x=[0,−1,−2,−3].\)

When counted, the number of elements, n(x), will give us 4.

And there we have our answer.

Hope this helped! :)

( ﾟдﾟ)つ Bye