The reverse effect of another operation
ex multiply - division
X^2+14x
To make it as perfect square binomial first divide the numerical coefficient of 14 by 2 which is 7. Then square the result[7] which is 49 and add it to the equation
x^2+14x+49
After that think of a number that has a square root of 49 then when u multiply the second term in the perfect square by the first and 2 it results to 14. So the answer is
[x+7]^2
A because you can't know the ages of the school's in the school district
Elliot is 63 inch tall
Jackson is x inch tall
x + 9 = 63
x + 9 (-9) = 63 (-9)
x = 54
Jackson is 54 in. tall
hope this helps