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Gnom [1K]
3 years ago
8

How to solve each equation by completing a square -4x^2+10x-40=-9x^2

Mathematics
2 answers:
docker41 [41]3 years ago
8 0

Answer:x=2,-4

Step-by-step explanation:

Ilia_Sergeevich [38]3 years ago
6 0

Answer:

x = -4 or 2

Step-by-step explanation:

-4x² + 10x − 40 = -9x²

First, move the x terms to one side and the constant to the other.

5x² + 10x = 40

Divide by the leading coefficient:

x² + 2x = 8

Take half of the b coefficient, square it, then add to both sides.

(2/2)² = 1

x² + 2x + 1 = 8 + 1

x² + 2x + 1 = 9

Factor the perfect square:

(x + 1)² = 9

Solve for x:

x + 1 = ±3

x = -1 ± 3

x = -4 or 2

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3 years ago
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Ganezh [65]
<h3><u>The x intercept is -4.</u></h3>

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4 years ago
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3 years ago
PLEASE HELP ON 5,6,8,9<br> DUE TOMORROW
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5. You have correctly shown the decimal equivalents of the numbers in selection C. Those are in order. The decimal equivalents for selection D would be

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The first of these is greater than the second of these, so this list is not in order. The correct choice is D.

6. √169 = 13, the only rational number in the lot. The correct choice is C.

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9. You have correctly plotted the points. When you connect them to make a geometric figure, you get a triangle that is 6 units high and 6 units wide. Its area will be half that of a square that is 6×6, so is 18 square units.

_____

The formula for the area of a triangle is

... A = (1/2)bh

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6 0
3 years ago
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