Question

Find the product of (7 − 9)(7 − 9) by using

suitable identity​

Answer 1

a^2+ b^2-2ab

7^2 + 9^2 - 2(7x9)

49+81- 2x63

49+81-126

130-126

=4

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Answer 2

Answer:

The identity is ( a- b)(a -b)

Or (a - b)^2

Step-by-step explanation:

so your answer is

• (7-9)(7-9)
• 49-63-63+81
• -126+130
• 4