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Question

If 3x+2x=7. Find the value of (9x2+4x2).

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Solution

We have,
3x+2x=7

On squaring both sides, we get
(3x+2x)2=72

(9x2+4x2+2×3x×2x)=49

(9x2+4x2+12)=49

(9x2+4x2)=4912

(9x2+4x2)=37

Hence, this is the answer.

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