4. Evaluate the expression. (8+9i)+(-5+4i) 5. Simplify the expression. 2i(7-i) A) 2+14i B) -2+14i C) 14-2i D) 14+2i 6. Evaluate the expression. (8-9i)(-5+6i) 7. Solve the quadratic equation by the square root method. x^2=144

1. Add complex numbers 2. Distribute over . Since , . So, .3. Multiply complex numbers . , so combine: , . Result: .4. Solve by square root method Take square roots: .