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solve the equation 4x^2-11=x^2-11+9x

Sagot :

[tex]{ \huge\text{ Answer}} [/tex]

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Solve the equation 4x² - 11 = x² - 11 + 9x.

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[tex]\sf{{ 4x² - 11 = x² - 11 + 9x }}[/tex]

[tex]\sf{{ {4x}^{2} - 11 - {x}^{2} + 11 - 9x = 0 }}[/tex]

[tex]\sf{{ {4x}^{2} - {x}^{2} - 9x = 0 }}[/tex]

[tex]\sf{{ {3x}^{2} - 9x = 0}}[/tex]

[tex]\sf{{ a = 3, \: b = - 9, \: c = 0 }}[/tex]

[tex]\sf{{ x\: = \: \frac{ -\: ( - 9) \:+ \: \sqrt{( - 9 {)}^{2}\: - \:4\: \times \:3 \:\times \:0 } }{2 \:\times \:3} }} [/tex]

[tex]\sf{{ x \:=\: \frac{ 9\: + \:\sqrt{ 9 ^{2}\: -\: 4 \: \times \:3 \times\: 0 } }{2 \:\:\times\: 3} }} [/tex]

[tex]\sf{{ \: x = \: \frac{9 \:+ \: \sqrt{ {9}^{2} } }{2\: \times\: 3} }}[/tex]

[tex]\sf{{ x\: = \: \frac{9\: + \:9}{2\: \times\: 3} }} [/tex]

[tex]\sf{{ x\: = \:\frac{18}{2 \:\times \:3} }} [/tex]

[tex]\large \rm\tt\underline{{ Final \: Answer:}}[/tex]

  • [tex]\large \rm x = 3 [/tex]

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