Question

Determine the missing term in the expression to make perfect square trinomial
1. x^2+3x+ _
2. y^2-24y+_
3. y^2- _ +64
4. X^2+ 4/7x+ _
--help me please

Answer 1

remember
\[(a+b)^{2} = a ^{2}+2ab +b ^{2}\]
and
\[(a-b)^{2} = a ^{2}-2ab +b ^{2}\]
this are the two types of perfect squares illustrated here, now can you find b?

Answer 2

is the b in #1 is 2?

Answer 3

nope, remember, its a perfect square, so in #1
2ab =3; and a =1,
so 2*1*b =3
b = 3/2
and hence \[b ^{2}\] = 9/4,
got it?

Answer 4

oww. got it. thanks

Answer 5

last question, how will you find the B^2 when the middle term is fraction?