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David thinks of a positive number. He squares it and multiplies the result by 6. He then adds on his original number and gets an answer of 15. What number is David thinking of. Give your answer as a fraction in its simplest form.

Sagot :

pcai26

Answer:

3/2

Step-by-step explanation:

write out equation

x^2*6+x=15

factor

6x^2+x-15=0

(2x-3)(3x+5)=0

x=3/2, x=-5/3

-5/3 is negative, so 3/2 is the answer