4 ( 2 + akar 3 ) (2 - akar 3) di bagi atau per 3 + akar 5 ? Bantuin dong.... Question from @Rohma240699

August 2018 2 45 Report

4 ( 2 + akar 3 ) (2 - akar 3) di bagi atau per 3 + akar 5 ? Bantuin dong

Alvinchan =8 + 4akar3 - 2 -akar3 / 3+akar 5

=6 - 3akar3 / 3+ akar5

=6-3akar3/3+akar5 * 3-akar5/3-akar5

=18 - 9 akar 15 / 3-5
=18-9 akar 15 / -2

1 votes Thanks 1

acim $\frac{4(2+ \sqrt{3})(2- \sqrt{3})}{3+ \sqrt{5}}=\frac{4(2^2- (\sqrt{3})^{2})}{3+ \sqrt{5}}=\frac{4(4-3)}{3+ \sqrt{5}} =\frac{4}{3+\sqrt{5}} \\ rationalkan : \\ \frac{4}{3+\sqrt{5}} = \frac{4}{3+\sqrt{5}}.\frac{3- \sqrt{5}}{3-\sqrt{5}}=\frac{4(3- \sqrt{5})}{3^2-(\sqrt{5})^2}= \frac{4(3- \sqrt{5})}{9-5} = \frac{4(3- \sqrt{5})}{4} = 3- \sqrt{5}$

2 votes Thanks 6

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