Question

expand(4+√5y)²
with process please​

Answer 1

Answer__

==16x² −40xy+25y²

explain

(4x−5y)²=(4x)²

−2(4x)(5y)+(5y)²

=16x²−40xy+25y 2

Answer 2

Answer:

$21 + 8 \sqrt{5}$

Step-by-step explanation:

$(4 + \sqrt{5} ) {}^{2}$

=

${4}^{2} + 2 \times 4 \times \sqrt{5} + { \sqrt{5} }^{2}$

=

$16 + 8 \sqrt{5} + 5$

=

$21 + 8 \sqrt{5}$