Question

4. Find two numbers whose difference is 1 and the product is 72.
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Answer 1

Answer:

9 and 8

Explanation:

(9-8)=1 and 9x8 = 72

Answer 2

Explanation:

x-y=1

and

x*y=72

(x-y)2 = x2+y2-2xy

(1)2=x2+y2 -144

x2+y2=-145

(x+y)2=x2 +y2+2(74)

(x+y)2 = 145+144

(x+y)2 =289

x+y= √289

x+y= 17

by alimination

x+y=17

x-y=1

2x=18

x=9

x+y=17

y=8