Question 203928
A(x) = x^2 +5x +6
.
A(5) = 5^2 +5*5 +6 = 56
.
A = (1/2)bh = (1/2) b (x+3)
A(5) = 56 = (1/2) 8 b = 4b
b= 56/4=14
.
check A = .5 * 14 * 8  = 56,,,ok