Equivalent expression for (24a + 56b)

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

Which value of c would make he following expression completely factored? 8x+cy

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36