Question

A^2+B^2=C^2 B=2. 1 C=2.9

Answer 1

Are you being asked to solve for A? B?
$A^{2} + B ^{2} = C^{2}$
$A ^{2} +B ^{2} =(2.9) ^{2}$
$A ^{2} + B^{2} =8.41$

Solve for A:
$A^2=8.41-B^2$
Take a plus of minus square root
A=$\sqrt{-b^2+8.41}$
A=$- \sqrt{-b^2+8.41}$

Solve B:
$A^2+B^2=8.41$
$B^2=-A^2+8.41$
Take plus or minus square roots
$B= \sqrt{A^2+8.41}$
$B= -\sqrt{A^2+8.41}$