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√89^2 -2*√89+1^2=90 -2√89
<span>(9x−5)^2−(x−10)^2=0
(9x-5+x-10)(9x-5-x+10)=0
(10x-15)(8x+5)=0
x</span>₁=-5/8
x₂=1.5
1) 16x² - 24x + 9 - 25 = 16x² - 24x - 16 = 8 ( 2x² - 3x - 2 )
2) a6 - ( a² + 8a + 16 ) = a6 - a² + 8a + 16
10√6=√(10²*6)=√600............................