I have no clue how to do these, and the book I have does not help at all. Can someone help me please? On this one i got stuck after Multiply. Solve. Solve
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Originally Posted by alexl13 I have no clue how to do these, and the book I have does not help at all. Can someone help me please? On this one i got stuck after e^(i*pi): you need only combine those radicals like you would with rational numbers and factorise Multiply. Solve. Solve 1. Use FOIL as normal: 2. It's the same as above but with different numbers 3. Cube to remove the radical: - easy to see that x=15 4. Square to remove the radical, use FOIL on the RHS and solve the resulting quadratic
Originally Posted by alexl13 I have no clue how to do these, and the book I have does not help at all. Can someone help me please? On this one i got stuck after ... that's all. Multiply. Solve. cube both sides ... Solve square both sides, then solve the resulting quadratic ... don't forget to check your results in the original equation. go ahead, try it. .
Originally Posted by alexl13 I have no clue how to do these, and the book I have does not help at all. Can someone help me please? On this one i got stuck after Multiply. Solve. Solve FOIL
Originally Posted by skeeter Where did you get get 90 from in Q2? I got with
Originally Posted by e^(i*pi) 4. Square to remove the radical, use FOIL on the RHS and solve the resulting quadratic I got but what confuses me is the exponent. Would I make is a square root so that it would be 4x?
Originally Posted by e^(i*pi) Where did you get get 90 from in Q2? I got with my mistake ... i was thinking 5 times 18 for some reason.
Originally Posted by alexl13 I got but what confuses me is the exponent. Would I make is a square root so that it would be 4x?
Originally Posted by alexl13 I got but what confuses me is the exponent. Would I make is a square root so that it would be 4x? No you can solve the quadratic using factorising, completing the square or the quadratic equation As there will be two, distinct real solutions
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