Math help asap!

Question

Where (x + d)2 = ax2 + bx + c, describe the relationship between d and b?

Answer 1

If you foil the expression (x+d)^2 you get x^2 +2dx +c. So the coefficient of x is 2d which is the equivalent of b in the expression ax^2 +BX + c

So 2d=b