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x2 + 8x + 100
Let x2 + 8x + 100 = 0. Complete the square (the best choice).
x2 + 8x + 100 = 0 add 42 and subtract 100 to both sides
x2 + 8x + 42 = 16 - 100
(x + 4)2 = -84 Take the square root of both sides
x + 4 = ± √-84 subtract 4 to both sides and write 84 as 4*21
x = -4 ± 2(√21)i
Thus, x = -4 - 2(√21)i or x = -4 + 2(√21)i.
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Solve this equation x2 - 8x plus 17 equals 0?
(4 ± i2) where i2 = -1
What is the square root of x square plus 8x plus 15 equals 0?
x2 + 8x + 5 = 0 is an expression, not a value, and thus does not actually have a square root. If you are looking to solve for x, then you can say: x2 + 8x + 5 = 0 ∴ x2 + 8x + 16 = 11 ∴ (x + 4)2 = 11 ∴ x + 4 = ±√11 ∴ x = 4 ±√11
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How do you solve x2 plus 6x equals -9?
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What is the equation for a circle with a center of 4 0 and a radius of 10?
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