exam Maths Puzzle Numerical Ability

Evaluate the discriminant b^2-4ac. Then use the answer to state how many real-number solutions exist for the equation. y=x^2+8x+16

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exam Other Question
Find the surface area and volume of a rectangular prism with the given dimensions. Round to the nearest tenth.

1.) e=6.5cm,w=15.1cm,h=4.5cm





thanks so much FOIL
(5z-u)(3z+3u)
this is my answer is it correct?
15z^2+12zu-3u^2