Math, asked by PragyaTbia, 1 year ago

प्रश्न 6 से 9 मे दिए गए प्रत्येक समीकरण को हल कीजिए : 21x^2 - 28x + 10 = 0

Answers

Answered by kaushalinspire
0

Answer:

Step-by-step explanation:

प्रश्नानुसार

21x^2 - 28x + 10 = 0

यहाँ     a  =  21

          b  =  -28

          c   =  10

x=\frac{-b±\sqrt{b^{2}-4ac} }{2a} \\\\=\frac{-(-28)±\sqrt{(-28)^{2}-4*21*10} }{2*21} \\\\=\frac{28±\sqrt{784-840} }{42} \\\\=\frac{28±\sqrt{-56} }{42} \\\\=\frac{28±\sqrt{54}i }{42}\\\\=\frac{28±{2\sqrt{14} }i }{42}\\\\x=\frac{2}{3} ± \frac{\sqrt{14} }{21} i

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