One problem of quadratic equation of one variable in mathematical function It is known that the value of algebraic formula x (x + 5) + 10 is opposite to that of algebraic formula 9x-25

One problem of quadratic equation of one variable in mathematical function It is known that the value of algebraic formula x (x + 5) + 10 is opposite to that of algebraic formula 9x-25

x2+5x+10=-9x+25
x2+14X-15=0
(x+15)(X-1)=0
X = - 15 or x = 1