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Question

Expand (5x3y+2)(5x+3y+2)

A
25x2+20x+49y2
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B
25x220x49y2
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C
16x2+20x+49y2
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D
16x2+25x+49y2
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Solution

The correct option is A 25x2+20x+49y2
[(5x+2)3y][(5x+2)+3y]

Taking (5x + 2) = a

= (a - 3y)(a + 3y)

= a2(3y)2

= (5x+2)29y2

= 25x2+20x+49y2

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