70 = 81-n
subtract 70 from both sides
0 = 11 - n
subtract 11 from both sides
-11 = -n
divide both sides by -1
11 = n
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81 times 70 equals 5,670. This can be calculated by multiplying 81 by 70, which results in 5,670. To do this, you would multiply the tens place of 81 (which is 8) by 70, resulting in 560, and then multiply the ones place of 81 (which is 1) by 70, resulting in 70, and finally add these two products together to get the final answer of 5,670.
34 = 81 so x is 4
23
54
2x - 81 = 0 Add 81 to both sides. 2x - 81 + 81 = 0 + 81 Substitute, -81 + 81 cancels out. 2x = 81 Divide by 2. x = 40.5 Above answer would be correct if your question was 2x but it was x2 so using the same method you would get x2 = 81 here the opposite of the square is the square root x = 9