91Ó°ÊÓ

Add or subtract as indicated. $$ 4 i+(-6-2 i) $$

Solve each problem. Find two numbers whose sum is 300 and whose product is a maximum.

Solve equation by using the square root property. Simplify all radicals. \((x-3)^{2}=25\)

Evaluate the expression \(\sqrt{b^{2}-4 a c}\) for the given values of \(a, b,\) and \(c .\) Simplify the radicals. See Sections \(1.3,8.1,\) and 8.2 $$a=1, b=2, c=-4$$

Use a calculator with a square root key to solve each equation. Round your answers to the nearest hundredth. \((k+2.14)^{2}=5.46\)

Use a calculator with a square root key to solve each equation. Round your answers to the nearest hundredth. \((r-3.91)^{2}=9.28\)

Use a calculator with a square root key to solve each equation. Round your answers to the nearest hundredth. \((1.71 m-6.20)^{2}=5.41\)