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2. 8a^2 . b^2
3. (4p^2.q^2)^3 = 4^3 p^6.q^6=64 p^6.q^6
4. (3a + y)^2 = (3a +y)(3a+y) = 9a^2 + 6ay +y^2
5. (5a -7)^2 = (5a -7)( 5a-7) = 25a^2 -70a +49
6.(7a^2 + qa^2) = a^2 (7+q)
7. (4a^2 -9a)^2 = 16a^4 -72a^3 +81a^2
8. (x+4)^2 = (x+4)(x+4) = x^2 +8x +16