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ANEK [815]
3 years ago
13

Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}​

Mathematics
1 answer:
Sergio039 [100]3 years ago
4 0

Answer:

The answer is (-3,7/2)

Step-by-step explanation:

2 {x}^{2}  - x - 21 = 0 \\ (2x - 7)(x + 3) = 0 \\ 2x - 7 = 0 \:  \:  \: or \:  \: x + 3 = 0 \\ x =  \frac{7}{2}  \:  \: and \: x =  - 3

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