Respuesta:
X=50
Explicación paso a paso:
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50=650
És una secuencia que va de 2 en 2.
x = 50
PA de razão r = 2
[tex]a_n=a_1+r(n-1)\\\\x=2+2(n-1)\\\\x=2 +2n-2\\\\x=2n\\\\n=\frac{x}{2} \\\\S_n=(a_1+a_n)\frac{n}{2} \\\\650=(2+x)\frac{\frac{x}{2} }{2} \\\\650=(2+x)\frac{x}{4} \\\\2600=(2+x)x\\\\2600=2x+x^2\\\\x^2+2x-2660=0\\\\\Delta=2^2-4.1.2600\\\\\Delta=4+10400\\\\\Delta=10404[/tex]
[tex]x=\frac{-2\pm\sqrt{10404} }{2} \\\\x=\frac{-2\pm102}{2}\\\\x=\frac{100}{2}\\\\x=50\\ou\\x=\frac{-104}{2}\\\\x=-52~~(n\tilde ao ~serve)[/tex]
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Respuesta:
X=50
Explicación paso a paso:
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50=650
És una secuencia que va de 2 en 2.
Verified answer
Respuesta:
x = 50
Explicación paso a paso:
PA de razão r = 2
[tex]a_n=a_1+r(n-1)\\\\x=2+2(n-1)\\\\x=2 +2n-2\\\\x=2n\\\\n=\frac{x}{2} \\\\S_n=(a_1+a_n)\frac{n}{2} \\\\650=(2+x)\frac{\frac{x}{2} }{2} \\\\650=(2+x)\frac{x}{4} \\\\2600=(2+x)x\\\\2600=2x+x^2\\\\x^2+2x-2660=0\\\\\Delta=2^2-4.1.2600\\\\\Delta=4+10400\\\\\Delta=10404[/tex]
[tex]x=\frac{-2\pm\sqrt{10404} }{2} \\\\x=\frac{-2\pm102}{2}\\\\x=\frac{100}{2}\\\\x=50\\ou\\x=\frac{-104}{2}\\\\x=-52~~(n\tilde ao ~serve)[/tex]