Question

calcule:
a)$3 \sqrt{2} + 5 \sqrt{3} - 8 \sqrt{2} + 12 \sqrt{4}$
b)
$(2 \sqrt{5} {)}^{2} - 8$
​

Answer 1

a)

$\mathsf{3 \sqrt{2} + 5 \sqrt{3} - 8 \sqrt{2} + 12 \sqrt{4}}\\\mathsf{-5\sqrt{2}+5\sqrt{3}+24}$

b)

$\mathsf{{(2\sqrt{5})}^{2}-8=20-8=12}$