Question

necesito resolver este ejercicio 2.(x+7)+x+7+x.x=89

Answer 1

2.(X+7)+X+7+X.X=89
2X+14+X+7+X²=89
X²+3X+21-89=0
X²+3X-68=0
X= $\frac{-b+- \sqrt{ b^{2}-4ac } }{2a}$
x= -$\frac{-3+ \sqrt{281} }{2}$ = 6. 88
x= $\frac{-3- \sqrt{281} }{2}$ = - 9.88