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The expression for the surface contribution of a tile design is $2 x^{2} - 5 x + 3 x y - y^{2}$ .
Find its value when $x = 3$ and $y = - 2$ .

Class 7Finding the Value of an ExpressionAlgebra

A-19
B11
C-7
D1

Step-by-Step Solution

2 x^{2} = 2 (9) = 18

;

- 5 x = - 15

;

3 x y = 3 (3) (- 2) = - 18

;

- y^{2} = - (- 2)^{2} = - 4

. Sum = 18 - 15 - 18 - 4 = -19.

Answer: A) -19

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