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How do you solve x2 81 equals 0?

Updated: 4/28/2022
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11y ago

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x: x2 - 81 = 0

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How do you solve x2-81 equals 0?

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


How do you solve 144x equals x2?

144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144


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x2 plus 3x plus 3 is equals to 0 can be solved by getting the roots.


How do you solve x2-2x-3 equals 0?

x2-2x-3 = 0 (x+1)(x-3) = 0 x = -1 or x = 3


How do you solve the problem 3a2 -36 plus 81 equals 0?

Divide all terms by 3:- x2-12+27 = 0 When factored:- (x-3)(x-9) = 0 Therefore: x = 3 or x = 9


Can you Solve x2 plus 13x equals -30?

x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}


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How do you solve x2 plus 7x equals 0?

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How do you do x2 equals 11x -10?

To solve for x: x2 = 11x - 10 x2 - 11x = -10 x2 - 11x + 10 =0 (x - 1)(x - 10) = 0 x = {1, 10)


Can you complete the square factor and use the quadratic formula to solve these two equations x2-4x-21 equals 0 and x2-3x-18 equals 0?

x2-4x-21 = 0 => x = -3 or x = 7 x2-3x-18 = 0 => x = -3 or x = 6


How do you factor x2 - 9x equals -8?

x2 - 9x = -8 ∴ x2 - 9x + 8 = 0 ∴ (x - 1)(x - 8) = 0 You can then solve it as well: ∴ x ∈ {1, 8}