solve 15 with full solution
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(7+3√5)(3-√5)-(7-3√5)(3-√5) /(3)^2-(√5)^2
=21-7√5+9√5-15-(21-7√5-9√5+15) /9-5
=6+2√5-(36-16√5) /4
=6+2√5-36+16√5 /4
=18√5-30 /4
=2(9√5-15)/4
=(9√5-15)/2
is your answer
=21-7√5+9√5-15-(21-7√5-9√5+15) /9-5
=6+2√5-(36-16√5) /4
=6+2√5-36+16√5 /4
=18√5-30 /4
=2(9√5-15)/4
=(9√5-15)/2
is your answer
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