54% of the time. 21 and 45 is 66. Two hours is 120. The you subtract
Hi friend,
This is a perfect square trinomial.
It can be recognised because it is of the form:
a^2−2ab+b^2=(a−b)^2
with a=3x and b=4
9x2−24x+16=(3x)2−(2⋅(3x)⋅4)+42
=(3x−4)2
19-20 = -1 u have to subtract left from tight <span />
