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Measures and Relations

Which of the ...

Question

Which of the following relation is incorrect ?

x+x=2x

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$y + y = y \times y$

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2x+2y=2(x+y)

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4x+2y=2(2x+y)

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Solution

The correct option is B
$y + y = y \times y$

$y + y = y \times y$ is a wrong relation

e.g let y=3

y+y=3+3=6

$y \times y = 3 \times 3 = 9$

Hence $6 \neq 9$ ,hence $y + y \neq y \times y$

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Which of the following is correct unchanging relation of perimeter of rectangle with length x and breadth as y?

(7 x^{2} - 2 y^{2} - 6 x y + y) - (2 y^{2} + 2 x^{2} - 1 + 2 x y)

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R =

(x, y), (2 x, 2 y)

(x + 2 y) (- 3 x - y) - (x + y) (x - y) + (x - 2 y) (- 2 x + y)

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