book Maths Puzzle Numerical Ability

What is the discriminant to determine how many real number solutions the quadratic equation -4j^2+3j-28=0 has

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book Other Question

Two similar triangles have sides in the ratio of 4:5. What is the ratio of their perimeters?

A regular square pyramid has a base with edges 16 and height 15. What is the volume and surface area of the pyramid? write each expression in radical form and simplify 17^5/4