exam Maths Puzzle Numerical Ability

How do yu solve this by using quadratic formula 3x (3x + 4) = -4 ?
please show steps.

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exam Other Question

Factor each expression a^2(b-c)-16b^2(b-c) The volume of a cone equals one-third times the product of pi,the square of the radius r of the base,and the height h.

42.Find the volume of a cone if r is 10 centi,eters and h is 30 centimeters??