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Lapatulllka [165]
2 years ago
15

Use the quadratic formula to solve x2 – 3x - 2 = 0.

Mathematics
2 answers:
BlackZzzverrR [31]2 years ago
8 0

Answer:

2.5 or 3.5

Step-by-step explanation:

The quadratic formula is x = -b +/- \frac{\sqrt{b^2 + 4ac}}{2a} .

a, b, and c are determined by the terms in the formula ax^2 + bx + c

They gave you the equation x^2 - 3x - 2, which fits that formula. a is 1, b is -3, and c is -2. So plug those values into the equation:

x = -(-3) +/- \frac{\sqrt{(-3)^2 + 4(1)(-2)}}{2(1)}

x = 3 +/- \frac{\sqrt{9 -8}}{2}

x = 3 +/- \frac{\sqrt{1}}{2}

x = 3 +/- \frac{1}{2}

So x is 3 plus or minus -1/2. 3 plus -1/2 is 2.5

3 minus -1/2 is 3.5

So the 2 possible x values are 2.5 and 3.5.

r-ruslan [8.4K]2 years ago
6 0

Answer:

x = 2 , 1

Step-by-step explanation:

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