Question

ifx4+lx3+mx2+12x+9 is a perfect square find the value of l and m​

Answer 1

Answer:

l=4,m=10

Step-by-step explanation:

From inspection we know that the

first term has to be x^2 and last term 3.

we therefore write

[x^2+bx+3]^2=x^4+l x^3+mx^2+12x+9

=x^2+2bx^3+[b^2+6]x^2+6bx+9

From inspection again we write

2b=l

b^2+6=m

6b=12

b=2

l=4

m=10