Question

if a-b=0.9 andab=0.36 find a+b anda^2-b^2

Answer 1

a- b = 0.9 implies that a= 0.9+b ,ab= 0.36 implies a= 0.36/b
b calculate then a calculate after a^2+b^2 value we need it

Answer 2

Hope u like my process.
____________________
Here we go,

a - b= 0.9 :: ab = 0.36

Formula to be used:
-------------------------------
( a +b) ² = (a - b) ² + 4ab

so, (a+ b) = [(a-b) ² +4ab]^½
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
@nd, a² - b² = (a+b) (a-b)
_______________________

a +b = [( a-b) ² + 4ab] =[(0.9)² + 4×0.36]

-----> = [0.81 + 1.44] = 2.25_(ans)_
—————————–——————
a² - b² = (a+b) (a-b)

-------> = 2.25 × 0.9 =2.025 _(ans)_
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Hope I got it.
Proud to help you.