expand (2a - 1/2a)^2
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1
(a+b)=asq+2ab+bsq
first plus asq then +2ab then +bsq
noyel99:
sorry I didn't understand
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12
(2a - 1/2a)²
Since (x - y)² ≅ x² - 2xy + y²
=> (2a)² - 2(2a)(1/2a) + (1/2a)²
= 4a² - 4/2 + 1/4a²
= 4a² + 1/4a² - 2
thank
you helped me, thank you
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