Question

8 times of a number is added to its sqare give à result 15. then find the number by using its quadratic equation​

Answer 1

Answer:

-4 +/- 4(2^1/2)

Step-by-step explanation:

Let no. be x.

According to given information

x^2 + 8x = 15

=> x^2 +8x - 15 = 0

=> x = (- 8 +/-(sqrt(64 -4(1)(-15)) /2

=> x = - 4 +/- 4sqrt2