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I am a bit confused about conjugates in algebra. I am supposed to multiply 8/(the square root of two + 4) by the square root of 2 4. My math book then goes on to simplify this to (8 times the square root of two minus 32) divided by … 
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could you walk me thorugh these problems simplfy square root 18  3 times sqaure root of 50 plus 5 times the square root of 80  2 times the square root of 125 I'm having troubles with the square root of 80 all of the other radicals … 
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69: 16x^2+8x3. I inserted this into the quadratic formula and got 8+/ the square root of (8^24(16)(3)/(2 times 16). This reduced to 8+/ the square root of (64+120)/32, which further reduced to 8+/the square root of 184/32. … 
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The formula is S=2 times the square root of 5 times L. S equals the estimated speed of a car and L equals the length of the skid marks prior to the accident. 100=2(square root of 5x) I have no idea how to solve this