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

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

anonymous · Answer

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?

anonymous · Answer

is the b in #1 is 2?

anonymous · Answer

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?

anonymous · Answer

oww. got it. thanks

anonymous · Answer

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