## Elementary Algebra

$= -.56$
We follow order of operations, so we first consider exponents, and then, starting on the left and going right, we do addition and subtraction. $=-0.4^{2} + 0.3^{2} - 0.7^{2}$ $= -0.16 + 0.09 - 0.49$ $= -.07-.49$ $=-.56$