Expanding Expressions and FOIL - SAT Subject Test in Math II
Card 0 of 4
Multiply the expressions:
Multiply the expressions:
You can look at this as the sum of two expressions multiplied by the difference of the same two expressions. Use the pattern
,
where 
and 
.
To find 
, you use the formula for perfect squares:
,
where 
and 
.
Substituting above, the final answer is 
.
You can look at this as the sum of two expressions multiplied by the difference of the same two expressions. Use the pattern
where
To find
where
Substituting above, the final answer is
Compare your answer with the correct one above
Expand the expression by multiplying the terms.
Expand the expression by multiplying the terms.
When multiplying, the order in which you multiply does not matter. Let's start with the first two monomials.
Use FOIL to expand.
Now we need to multiply the third monomial.
Similar to FOIL, we need to multiply each combination of terms.
Combine like terms.
When multiplying, the order in which you multiply does not matter. Let's start with the first two monomials.
Use FOIL to expand.
Now we need to multiply the third monomial.
Similar to FOIL, we need to multiply each combination of terms.
Combine like terms.
Compare your answer with the correct one above
Which of the following values of 
would make
a prime polynomial?
Which of the following values of
a prime polynomial?
A polynomial of the form 
whose terms do not have a common factor, such as this, can be factored by rewriting it as 
such that 
and 
; the grouping method can be used on this new polynomial.
Therefore, for 
to be factorable, 
must be the sum of the two integers of a factor pair of 
. We are looking for a value of 
that is not a sum of two such factors.
The factor pairs of 96, along with their sums, are:
1 and 96 - sum 97
2 and 48 - sum 50
3 and 32 - sum 35
4 and 24 - sum 28
6 and 16 - sum 22
8 and 12 - sum 20
Of the given choices, only 30 does not appear among these sums; it is the correct choice.
A polynomial of the form
Therefore, for
The factor pairs of 96, along with their sums, are:
1 and 96 - sum 97
2 and 48 - sum 50
3 and 32 - sum 35
4 and 24 - sum 28
6 and 16 - sum 22
8 and 12 - sum 20
Of the given choices, only 30 does not appear among these sums; it is the correct choice.
Compare your answer with the correct one above
How many of the following are prime factors of the polynomial 
?
(A) 
(B) 
(C) 
(D) 
How many of the following are prime factors of the polynomial
(A)
(B)
(C)
(D)
making this polynomial the difference of two cubes.
As such, 
can be factored using the pattern
so
(A) and (C) are both factors, but not (B) or (D), so the correct response is two.
making this polynomial the difference of two cubes.
As such,
so
(A) and (C) are both factors, but not (B) or (D), so the correct response is two.
Compare your answer with the correct one above