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vovangra [49]
3 years ago
7

Expand and simplify (2V5 + 1)(3V5 - 1)

Mathematics
1 answer:
disa [49]3 years ago
6 0

Answer:

29+\sqrt{5}

Step-by-step explanation:

Let \sqrt{5} = a for simplicity. now our equation is

(2a+1)(3a-1)

now expand

2a*3a-2a+3a-1 = 6a^2+a-1

remember that \sqrt{5} = a

thus we get6\sqrt{5}^2+\sqrt{5}-1 = 6(5)-1+\sqrt{5}=30-1+\sqrt{5}=29+\sqrt{5}

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