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Earn +20 ptsQ: What number do you add to complete the square x2-19?
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Continue Learning about Other Math
What number must you add to complete the square x2 minus 4x equals 1?
4
What number must you add to complete the square x2 plus 16x equals -7?
square root -5 minus 14 or - square root -5 minus 14
What number must you add to complete the square of x2 12x -9?
The idea is to take half the linear part (12, in this case), then square it. The constant part must be equal to this result.
What number must you add t complete the square x2 plus 18x equals -13?
81. To complete the square, halve the coefficient of the x term (18/2 = 9) and add the square of this (92 = 81) to both sides: x2 + 18x = -13 ⇒ x2 + 18x + 81 = -13 + 81 ⇒ (x + 9)2 = 68
What number must you add to complete the square of x2 plus 20x equals 39?
x2 + 20x - 39 = 0: Add 61 giving: x2 + 20x + 100 = (x + 10)2
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