Question

The product of twenty less than eight times a number and thirty less than two times a number equals zero. Find the number(s).

Answer 1

The number= 15 or 5/2

Explanation:

(8x-20)(2x-30)=0

16x^2-240x-40x+600=0

16x^2-280x +600 =0

divide by 8

2x^2-35x+75=0

2x^2-30x-5x+75=0

2x(x-15)-5(x-15)=0

(x-15)(2x-5)=0

x=15 OR 5/2