(b) one please help to solve

(b) one please help to solve On expansion Of (a ± and its corollaries I. Expand the squares of the following: (b)5a+3b

Dear Student,
Solution:

1 . (a) {(4 x + y)}^{2} = {(4 x)}^{2} + {(y)}^{2} + 2 (4 x) (y) {(u \sin g (a + b)}^{2} = a^{2} + b^{2} + 2 a b) = 16 x^{2} + y^{2} + 8 x y 1 . (b) {(5 a + 3 b)}^{2} = {(5 a)}^{2} + {(3 b)}^{2} + 2 (5 a) (3 b) {(u \sin g (a + b)}^{2} = a^{2} + b^{2} + 2 a b) = 25 a^{2} + 9 b^{2} + 30 a b

Regards