Brian is solving the equation. What value must be added to both sides of the equation to make the left side a perfect-square trinomial?.

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Find the difference (8ab+a+2) - (3ab+6)

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)