Question

Please say the answer of 20. Please
Fsar

Answer 1

Answer:

1-a

Step-by-step explanation:

x = 3(+/-)√(9+4a^2+4a-8)

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2

= 3(+/-)√(4a^2+4a+1)

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2

= 3 - √{(2a)^2 + (1)^2 + 2.2a.1}

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2

= 3-(2a+1)

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2

= (2-2a)/2

= 1-a