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If 2a + 3b = 8 and ab = 5, then find the...

If 2a + 3b = 8 and ab = 5, then find the value of `4a^2+9b^2`.
यदि 2a + 3b = 8 और ab = 5, तो `4a^2+9b^2` का मान ज्ञात कीजिए ।

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