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Sana filled in a table of values for two expressions but left one cell as '?'. What number goes in that cell?

Class 7Finding the Value of an ExpressionAlgebra

A60
B32
C28
D12

Step-by-Step Solution

The cell is

2 x^{2} - x

at

x = 4 : 2 \times 4^{2} - 4 = 32 - 4 = 28

. Squaring

2 x

gives

64 - 4 = 60

; forgetting

- x

gives 32.

Answer: C) 28

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