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Question

What should be added to x2+6x−18 to get 3x3+x2+16?

A
3x36x2
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B
3x3+2x26x2
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C
3x34x2
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D
3x3+2x26x+2
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Solution

The correct option is A 3x36x2
Let the expression to be added be 'y',
(x2+6x18)+y=3x3+x2+16
y=(3x3+x2+16)(x2+6x18)

Grouping the like terms together we get,
y=3x3+(x2x2)6x+(1618)
y=3x36x2
Hence, the expression to be added is 3x36x2.


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