Algebra

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Mathfailer Mathfailer
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Algebra

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AlgebraHouse AlgebraHouse
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Re: Algebra

 i(3i+6)(2−7i)
= (3i² + 6i)(2 - 7i)   {used distributive property}
= [3(-1) + 6i](2 - 7i)   {evaluated i² to be -1)
= (-3 + 6i)(2 - 7i)   {multiplied 3 by -1}
=  -6 + 21i + 12i - 42i²   {used FOIL method / distributive property}
= -6 + 33i - 42(-1)   {combined like terms and evaluated i² to be -1}
= -6 + 33i + 42   {multiplied -42 by -1}
= 36 + 33i   {combined like terms}

- Algebra House