if 13 times a number x is added to twice its square.the result is 84.find x

2 x^2 + 13 x - 84 = 0

use the quadratic formula

Let the number be x

13x + 2(x^2) = 84
13x + 2x^2 - 84 = 0
2x^2 + 13x - 84 = o
2x^2 +21x-8x -84=0
(X-4) (2x+21) =0
X=4 or x=-10.5

Thanks

answer me nah

I also don't know it

2 x 2 +13 x - 84 use quadratic equation

I really don't know am also asking

If 13 times a number is added to twice it square the result is 84 obtain a quadratic equation, find x