Question

4x cuadrada mas 4x igual a 15

Answer 1

Respuesta:

4$x^{2}$ + 4$x$ = 15

4$x^{2}$ + 4$x$ - 15 = 0

Formula General =  $\frac{-b±\sqrt[2]{b^{2} - 4ac } }{2a}$  a= 4    b=4    c=-15

⇒ $\frac{-4±\sqrt[2]{4^{2} - 4(4)(-15) } }{2(4)\\}$  = $\frac{-4±\sqrt[2]{16 + 240 } }{8}$ =$\frac{-4±\sqrt[2]{256 } }{8}$

$x_{1}$ = $\frac{{-4+16}}{8}$ = $\frac{12}{8}$ = $\frac{3}{2}$ = 1.5

$x_{2}$ = $\frac{{-4-16}}{8}$ = $\frac{-20}{8}$= $-\frac{5}{2}$ = -2.5