 
1) 2x^2 - 3x> 0; 3) 7x^2+5x<0; 1) 4 - 9x^2 <0; 3) 81 - 16x^2>0; 1) 4x2 + 11x^2 - 3
< 0; 3) 3.x3 - 11x^2 - 20 > 0; 1) x^2 + 14x + 49 > 0; 3) 9x^2 - 6x+1 <0: 0
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            It looks like you have provided several inequalities involving quadratic expressions. I'll solve each of them for you.
- : To solve this inequality, we need to find the values of x for which . First, factor the expression:
Now, set each factor equal to zero and solve for x:
and
So, the critical points are and . Now, we can test the intervals between these critical points:
Test : Test : Test :
So, the solution to the inequality is or .
- : First, factor the expression:
Now, set each factor equal to zero and solve for x:
and
So, the critical points are and . Now, test the intervals between these critical points:
Test : Test :
So, the solution to the inequality is .
- : First, rearrange the inequality:
Now, factor out a negative sign:
Factor the expression inside the parentheses:
Now, set each factor equal to zero and solve for x:
and
and
and
So, the critical points are and . Now, test the intervals between these critical points:
Test :
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