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Question

Mark the correct alternative in the following question:

What should be added to 3x2 + 4 to get 9x2 - 7?

(a) 6x2 - 11 (b) 6x2 + 11 (c) 12x2 - 11 (d) 12x2 + 11

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Solution

Since, (9x2 - 7) - (3x2 + 4) = 9x2 - 7 - ​3x2 - 4 = 6x2 - 11

So, 6x2 - 11 should added to 3x2 + 4 to get 9x2 - 7.

Hence, the correct alternative is option (a).

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