Maths ALevel Homework helpWatch
In the expansion of (a + 3x)⁸, the coefficent of x² is 32/27 times the coefficent of x⁵. What is the value of a?
now compare the coefficients of the x2 and x5 terms.
we have to do it using binomial theorem and with some formula using factorials and i really don't get it?
8C3 * a5 * ( 3x )3....
which is 56*a5*27*x3