Question

find the value of
(4+√5y)^2​

Answer 1

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Formula = (a+b)²= a²+b²+2ab

(4+√5y)².

= 4²+(√5y)²+2(4)(√5y)

= 16+5y²+8√5y

Answer 2

Step-by-step explanation:

$(4 + \sqrt{5})^{2} \\ = 4 ^{2} + 2 \times 4 \times \sqrt{5} + (\sqrt{5}) ^{2} \\ = 16 + 8 \sqrt{5} + 5$

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