xineohp
xineohp xineohp
  • 21-05-2020
  • Mathematics
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[tex] {20x}^{2} + 7x - 49[/tex]
Please solve for the value of x with explanation.​

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nktselepov
nktselepov nktselepov
  • 21-05-2020

[tex] {20x}^{2} + 7x - 49 = 0 \\ D = {7}^{2} - 4 \times 20 \times ( - 49) = 3969 = {63}^{2} \\ x_1 = \dfrac{ - 7 + 63}{40} = 1.4 \\ x_2 = \dfrac{ - 7 - 63}{40} = - 1.75[/tex]

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