find the product
(9x+7) (9x-7)
Answers
Answer:
81x²-49
Step-by-step explanation:
Use the identity:
(a+b)(a-b) = a²-b²
Here, a = 9x and b=7
Substituting the values,
(9x+7) (9x-7) = (9x)²-(7)²
= 81x²-49
Answer:
Step-by-step explanation:
Expand
(
9
x
+
7
)
(
9
x
−
7
)
using the FOIL Method.
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Apply the distributive property.
9
x
(
9
x
−
7
)
+
7
(
9
x
−
7
)
Apply the distributive property.
9
x
(
9
x
)
+
9
x
⋅
−
7
+
7
(
9
x
−
7
)
Apply the distributive property.
9
x
(
9
x
)
+
9
x
⋅
−
7
+
7
(
9
x
)
+
7
⋅
−
7
Simplify terms.
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Combine the opposite terms in
9
x
(
9
x
)
+
9
x
⋅
−
7
+
7
(
9
x
)
+
7
⋅
−
7
.
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9
x
(
9
x
)
+
7
⋅
−
7
Simplify each term.
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Multiply
x
by
x
.
9
⋅
9
x
2
+
7
⋅
−
7
Multiply
9
by
9
.
81
x
2
+
7
⋅
−
7
Multiply
7
by
−
7
.
81
x
- 2
−