Giải phương trình vi phân cấp 2 ạ b) y"+ (m+ a + 2)y- (m+ a + 3)y= (x + a + 3)cos(m+3)x

c) y"+ (n + 2)y (n + 3)y= (m+b)x - (a + n)

What is the range? can’t seem to find it out

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).