3 years ago

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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