Q: What is 8 plus 21 square?

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plus or minus 21

-8+(-21) = -29

Root 64 is 8, if by root you mean the square root. Then the problem become -square root 84(6+8) which is the - square root of 84(14) But square root of 84 is 2(square root of 21) so the final answer comes from -2(square root 21)x14 which is -28square root (21)

21

if you mean X²+8X-5=0: X1=-8/2 - Square root of ((8/2)²+5) X1=-4 - Square root of 21 X1 is about -8.58 X2=-8/2 + Square root of ((8/2)²+5) X2=-4 + Square root of 21 X2 is about 0.58

3 + 8 + 21 + 22 + 36 = 90 Ans.// What do you mean?

-21

It is: -21

8 plus 7 is 15. 15 plus 6 is 21. :)

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