What value of 'a' would make the expression a perfect square?
x^2 + 12x-a​

a = -36

Step-by-step explanation:

Here, we want to get the value of a that would make the expression a perfect square

we simply divide the coefficient of x by 2

That would give 12/2 = 6

Now, square this = 6^2 = 36

Since the number we are to add will be positive so we can have a perfect square of the measure (x + 6)^2;

Then a has to be negative for the last number to turn out positive

Thus, a = -36

answer: 4/6 =5/7.5

step-by-step explanation: it is based on scale and the scale between the two is 1.25. the answer is correct but i dont know if i explained it right