Question

$(3 \sqrt{5} - 2 \sqrt{3})^{2}$
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Answer 1

Răspuns:

(a-b)²=a²-2ab+b²

(3v5)²-2•3v5•2v3+(2v3)²=

= 45-12v10+12=

=57-12v10

Answer 2

(3√5-2√3)^2

=(3√5)^2-2*3√5*2√3+(2√3)^2

=9*5-12√15+4*3

=45-12√15+12

=57-12√15

=3(19-4√15)

Formula:

(a-b)^2=a^2-2ab+b^2

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