rationalise the denominator
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Step-by-step explanation:
=7+3√5÷3+√5×3-√5÷3-√5-7+3√5÷3-√5×3+√5÷3+√5
=21+9√5-7√5-15÷9-5 -21+9√5+7√5+15÷9-5
=6+2√5÷4 - 36+16√5÷4
=2(3+√5)÷4 - 4(9+4√5)÷4
=3+√5÷2 - 9+4√5
=3+√5-(18+8√5)÷2
=3+√5-18-8√5÷2
=-15-7√5÷2
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