A rectangular-based pyramid is cut horizontally, leaving the frustum and the pyramid shown below. Work out the volume of the fru
stum. Give your answer in cm", and give any decimal answers to 1 d.p. 
1 answer:
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Answer:
x = - 3 ± 2
Step-by-step explanation:
Given
2x² + 12x = 6 ( divide through by 2 )
x² + 6x = 3
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(3)x + 9 = 3 + 9
(x + 3)² = 12 ( take the square root of both sides )
x + 3 = ± = ± 2
( subtract 3 from both sides )
x = - 3 ± 2 ← exact solutions