exam Maths Puzzle Numerical Ability

Square the binomial
(7a+4y)^2
(7a+4y)(7a+4y)
F (7a)(7a)=49a^2
O (7a)(4y)= 28ay
I (4y)(7a) = 28ay
L (4y) (4y) = 16y^2
49a^2+56ay+16y^2

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