Question

if a-b =0.9 and ab =0.36;find 1 a+b square b square

Answer 1

I hope you are asking for a² + b²

if so

(a-b)² = a² + b² - 2ab

(0.9)² = a² + b² - 2x 0.36

0.81 = a² + b² - 0.72

a² + b² = 0.81 + 0.72 = 1.53