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Question
Find the product by using the formula.
(4) (3y + 5) (3y − 5)
(4) (3y + 5) (3y − 5)
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Solution
(3y + 5) (3y − 5)
The given expression is of the form (a + b) (a − b).
Thus, we can use the identity (a + b) (a − b) = a2 − b2 .
∴ (3y + 5) (3y − 5) = (3y)2 − (5)2
= 9y2 − 25
The given expression is of the form (a + b) (a − b).
Thus, we can use the identity (a + b) (a − b) = a2 − b2 .
∴ (3y + 5) (3y − 5) = (3y)2 − (5)2
= 9y2 − 25
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