Question

6 and 6 times of a number is added to its square and gets 78. write this statement in the form of the equation?​

Answer 1

Answer:

If a number added to twice its square, the result is 21. Find the number.

Answer 2

Answer:

let the number is x

then,

6+6x+x^2=78

=.> x^2+6x+6-78=0

=> x^2+6x-72=0

=> x^2+12x-6x-72=0

=> x(x+12)-6(x+12)=0

=> (x+12)(x-6)=0

=> x+12=0

=> x= -12

again, x-6=0

=> x=6