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Given: $$3x^2 + 2x + 2 = 0$$ 2.1.1 Determine the numerical value of the discriminant (Δ) of the equation - NSC Technical Mathematics - Question 2 - 2020 - Paper 1

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Given:---$$3x^2-+-2x-+-2-=-0$$----2.1.1-Determine-the-numerical-value-of-the-discriminant-(Δ)-of-the-equation-NSC Technical Mathematics-Question 2-2020-Paper 1.png

Given: $$3x^2 + 2x + 2 = 0$$ 2.1.1 Determine the numerical value of the discriminant (Δ) of the equation. 2.1.2 Hence, describe the nature of the roots of the... show full transcript

Worked Solution & Example Answer:Given: $$3x^2 + 2x + 2 = 0$$ 2.1.1 Determine the numerical value of the discriminant (Δ) of the equation - NSC Technical Mathematics - Question 2 - 2020 - Paper 1

Step 1

2.1.1 Determine the numerical value of the discriminant (Δ) of the equation.

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Answer

To find the discriminant (Δ) of the quadratic equation 3x2+2x+2=03x^2 + 2x + 2 = 0, we use the formula: Δ=b24acΔ = b^2 - 4ac, where a=3a = 3, b=2b = 2, and c=2c = 2.

Calculating: Δ=(2)24(3)(2)Δ = (2)^2 - 4(3)(2) Δ=424Δ = 4 - 24 Δ=20Δ = -20.

Step 2

2.1.2 Hence, describe the nature of the roots of the equation.

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Since the discriminant (Δ) is negative (Δ=20Δ = -20), it indicates that the quadratic equation has no real roots. Therefore, the roots are non-real (or complex) and appear as conjugate pairs.

Step 3

2.2.1 Write the equation in the form ax² + bx + c = 0.

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Answer

Starting from the given equation: x22px=3p2x^2 - 2px = 3p^2, we can rearrange it to the standard quadratic form: x22px3p2=0x^2 - 2px - 3p^2 = 0, where a=1a = 1, b=2pb = -2p, and c=3p2c = -3p^2.

Step 4

2.2.2 Hence, without solving the equation, show that the roots of the equation are rational.

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Answer

To determine whether the roots are rational, we calculate the discriminant (Δ) for the equation x22px3p2=0x^2 - 2px - 3p^2 = 0:

Using the formula: Δ=b24acΔ = b^2 - 4ac, we have: Δ=(2p)24(1)(3p2)Δ = (-2p)^2 - 4(1)(-3p^2) Δ=4p2+12p2Δ = 4p^2 + 12p^2 Δ=16p2Δ = 16p^2.

Since 16p216p^2 is a perfect square (as 1616 and p2p^2 are both non-negative), it implies that the roots of the equation will also be rational.

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