Question

please solve fast and right to get brainliest​

Answer 1

a-b = 0.9

ab = 0.36

I) (a+b)^2-(a-b)^2=4ab

(a+b)^2 - 0.9^2=4×0.36

(a+b)^2 - 0.81 = 1.44

(a+b)^2 = 1.44 + 0.81

a+b = √2.25

$\fbox{a + b = 1.5}$

II) (a+b)(a-b) = a^2 - b^2

1.5 × 0.9

= 1.35

$\fbox{ {a}^{2} - {b}^{2} = 1.35}$