Larissa possui R$8,00.
[tex]x {}^{2} + 3x = 88 \\ x {}^{2} + 3x - 88 = 0\\ \boxed{a = 1 \: , \: b = 3 \: , \: c = - 88} \\ x = \frac{ - b± \sqrt{b {}^{2} - 4ac} }{2a} \\ x = \frac{ - 3± \sqrt{3 {}^{2} - 4 \: . \: 1 \: . \: ( - 88) } }{2 \: . \: 1} \\ x = \frac{ - 3 ± \sqrt{9 + 352} }{2} \\ x = \frac{ - 3± \sqrt{361} }{2} \\ x = \frac{ - 3± 19 }{2} \\ x = \frac{ - 3 + 19}{2} = \frac{16}{2} = \boxed{\boxed{\boxed{8}}} \\ x = \frac{ - 3 - 19}{2} = \frac{ - 22}{2} = \boxed{\boxed{\boxed{ - 11}}} \\ [/tex]
Desconsidere a raiz negativa.
att. yrz
