GSCE Mathematics Problem Solving Algebra Higher Tier.

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Presentation transcript:

GSCE Mathematics Problem Solving Algebra Higher Tier

Write an equation for the volume of the cuboid and solve Helping hand 5cm x x + 4 A cuboid has sides 5 cm by x cm by x + 4cm. The volume of the cuboid is 60cm 3. What are the dimensions of the cuboid ?

Answer Volume of cuboid = 5 x ( x + 4) = 60 5x x = 60 5x x – 60 = 0 5(x 2 + 4x – 12) = 0 x 2 + 4x – 12 = 0 (x + 6 ) ( x – 2 ) = 0 x + 6 = 0 or x – 2 = 0 x = -6 x = 2 x can’t be -6 cm so x = 2cm The dimensions are 5cm by 2cm by 6cm