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MaRussiya [10]
3 years ago
6

Can someone please explain what they did wrong in the problem and explain how you would fix it. (8grade math)

Mathematics
1 answer:
NeX [460]3 years ago
5 0

Answer:

They got their points wrong, and did the wrong quadrant.

Step-by-step explanation:

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Using the discriminant, describe the nature of the roots for the equation <br> 49x^2 − 28x + 4 = 0.
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Put the equation in standard form by bringing the 4x + 1 to the left side.

7x2 - 4x - 1 = 0

We use the discriminant to determine the nature of the roots of a quadratic equation. The discriminant is the expression underneath the radical in the quadratic formula: b2 - 4ac.

b2 - 4ac In this case, a = 7, b = -4, and c = -1

(-4)2 - 4(7)(-1)

16 + 28 = 44

Now here are the rules for determining the nature of the roots:

(1) If the discriminant = 0, then there is one real root (this omits the ± from the quadratic formula, leaving only one possible solution)

(2) If the discriminant > 0, then there are two real roots (this keeps the ±, giving you two solutions)

(3) If the discriminant < 0, then there are two imaginary roots (this means there is a negative under the radical, making the solutions imaginary)

44 > 0, so there are two real roots

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