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If you actually meant that as you wrote it:
x2 = 7 - 4
Then the answer is simple:
x2 = 7 - 4
∴ x2 = 3
∴ x = √3
If on the other hand, you actually wanted to say:
x2 = 7x - 4
Then you can find it this way:
x2 = 7x - 4
∴ x - 7x = -4
∴ x - 7x + (7/2)2 = -4 + (7/2)2
∴ (x - 7/2)2 = -16/4 + 49/4
∴ x - 7/2 = ± √(33/4)
∴ x = 7/2 ± √33/2
∴ x = (7 ± √33) / 2
Alternatively, if you meant to say:
x2 = 7 - 4x
Then the answer is:
x2 = 7 - 4x
∴ x2 + 4x = 7
∴ x2 + 4x + 4 = 7
∴ (x + 2)2 = 7
∴ x + 2 = ± √7
∴ x = -2 ± √7
Wiki User
∙ 13y ago
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