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Evaluate `lim_(x to 20) (x^(2)-4)/((sqrt(3x)-2)-(sqrt(x)+2))` |
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Answer» Given, `underset(xto20)"lim"(x^(2)-4)/((sqrt(3x)-2)-(sqrt(x)+2))= underset(xto2)"lim"((x^(2)-4)sqrt(3x-2)+sqrt(x+2))/((sqrt(3x-2)^(2)-sqrt(x+2))(sqrt(3x-2-sqrt(x+2))))` `=underset(xto2)"lim"((x^(2)-4)(sqrt(3x-2)+sqrtx+2))/((3x-2)-(x+2))` `=underset(xto2)"lim"((x^(2)-4)(sqrt(3x-2)+sqrt(x+2)))/(2x-4)` `=underset(xto2)"lim"((x+2)(x-2)sqrt(3x-2)+sqrt(x+2))/(2(x-2))` `=underset(xto2)"lim"(x+2)(sqrt(3x-2)+sqrt(x+2))/(2)` `=(4(2+2))/(2)=8` |
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