Question

5. Simplify the following expression and find its value when x = 7 and y = – 2.
2(x²+xy) + 7 – xy​

Answer 1

Answer:

91

Step-by-step explanation:

Given,

x = 7

y = - 2

To find : 2 ( x²+ xy ) + 7 - xy = ?

2 ( x²+ xy ) + 7 - xy

= 2x² + 2xy + 7 - xy

= 2x² + 2xy - xy + 7

= 2x² + xy + 7

= 2 ( 7 )² + 7 ( - 2 ) + 7

= 2 ( 49 ) - 14 + 7

= 98 - 7

= 91

Answer 2

Step-by-step explanation:

$2(x ^{2} + xy) + 7 - xy \\ 2(7^{2} + (7 \times - 2) + 7 - 7 \times ( - 2) \\ 2(49 + ( - 14) + 7 - ( - 14) \\ = 112$

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