Algebra · real student question

Add the following terms if possible: 5 times the square root of 50 plus 3 times the square root of 32.

Question

Add the following terms if possible:

550+3325\sqrt{50} + 3\sqrt{32}

Step-by-step solution

  1. Notice the radicals do not match yet. 50\sqrt{50} and 32\sqrt{32} have different radicands, so they cannot be added as written. Simplifying first is what makes them alike.

  2. Simplify the first radical. 50=25250 = 25 \cdot 2, so 50=52\sqrt{50} = 5\sqrt{2} and the first term becomes 552=2525 \cdot 5\sqrt{2} = 25\sqrt{2}.

  3. Simplify the second radical. 32=16232 = 16 \cdot 2, so 32=42\sqrt{32} = 4\sqrt{2} and the second term becomes 342=1223 \cdot 4\sqrt{2} = 12\sqrt{2}.

  4. Add the like radicals. Both terms now carry 2\sqrt{2}, so 252+122=37225\sqrt{2} + 12\sqrt{2} = 37\sqrt{2}.

  5. Check numerically. 55035.355345\sqrt{50} \approx 35.35534 and 33216.970563\sqrt{32} \approx 16.97056; their sum is 52.32590\approx 52.32590, and 37252.3259037\sqrt{2} \approx 52.32590.

Answer

37237\sqrt{2}

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