Question

15 is added to a square the result was 8 times of the original, find that number

Answer 1

Answer:

x=3,5

Step-by-step explanation:

let x be number

Given,

15 is added to a square the result was 8 times of the original,

15 is added to square means

x^2+15

then the result is 8 times the original

x^2+15=8x

x^2-8x+15=0

x^2-5x-3x+15=0

x(x-5)-3(x-5)=0

(x-5)(x-3)=0

x=3,5