Question

Ifx+y=5andxy=4,findx2 –y2 using indenties

Answer 1

Step-by-step explanation:

x+y=5

xy=4

therefore,x =4 and y=1

thus 4^2-1^2=?

(4-1)(4+1). [a^2-b^2=(a-b)(a+ b)]

16+4-4-1

15

Answer 2

Answer:

x=4/y

then

4/y +y =5

(4+y^2 ) /y =5

y2-y =5-4

y2 -y =1

y2=1+y

(y=5/x)

y2= 1+(5/x)