, 2-2a = √ 2a, find the value of a, I know the answer, 3Q When I first came here, I didn't know~

, 2-2a = √ 2a, find the value of a, I know the answer, 3Q When I first came here, I didn't know~

2-2a=√2a
(2+√2)a=2
a=2/(2+√2)=2(2-√2)/(2+√2)(2-√2)=2(2-√2)/2=2-√2

Calculation: (2a-1) (2a-3) - (2a + 1) ^ 2

=4a²-8a+3-(4a²+4a+1)
=4a²-8a+3-4a²-4a-1
=-12a+2

A ^ 2 + 2A = 1 calculate what a is and find the value of 3 (a ^ 2 + 2a) + 2
It's better to be simple and easy to understand

What is a ^ 2 + 2A = 1
a²+2a+1=1+1=2;
(a+1)²=2;
a+1=±√2;
a=-1±√2;
Find the value of 3 (a ^ + 2a) + 2
=3×1+2
=3+2
=5；
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