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Please help me with this math

Please Help Me With This Math class=

Sagot :

Answer:

[tex]x=\displaystyle\frac{5+\sqrt{21}}{2}[/tex] or [tex]x=\displaystyle\frac{5-\sqrt{21}}{2}[/tex]

Step-by-step explanation:

Hi there!

[tex](x+1)^2=7x[/tex]

Expand the parentheses:

[tex]x^2+2x+1=7x[/tex]

Move 7x to the other side:

[tex]x^2+2x-7x+1=0\\x^2-5x+1=0[/tex]

Apply the quadratic formula:

[tex]x=\displaystyle\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex] where [tex]ax^2+bx+c=0[/tex]

Plug in the values a, b and c:

[tex]x=\displaystyle\frac{-(-5)\pm\sqrt{(-5)^2-4(1)(1)}}{2(1)}\\\\x=\displaystyle\frac{5\pm\sqrt{25-4}}{2}\\\\x=\displaystyle\frac{5\pm\sqrt{21}}{2}[/tex]

I hope this helps!