Question

Me ajudem

Efetue
A)(√7+√3)^2
B)(3-√7)^2

Answer 1

Resposta:

$(x+y)^2=x^2+2xy+y^2$

$(x-y)^2=x^2-2xy+y^2$

A)

$(\sqrt{7} +\sqrt{3} )^2=(\sqrt{7} )^2+2*\sqrt{7}*\sqrt{3} +(\sqrt{3})^2=7+2\sqrt{21} +3=10+2\sqrt{21}$

B)

$(3-\sqrt{7} )^2=3^2-2*3*\sqrt{7} +(\sqrt{7} )^2=9-6\sqrt{7} +7=16-6\sqrt{7}$