Question

Find the value of a if, 9a = 76² - 67² *

140

146

143

147

​

Answer 1

Answer:

C ,143

9a=76*76-67*67

9a=5776-4489

9a=1287

a=1287/9

a=143

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Answer 2

Answer:

143

Step-by-step explanation:

9p = 76² - 67²

we can solve this using the identity :

a² - b² = ( a+b ) ( a-b )

So, 9p = (76+67)(76-67)

9p = 143 × 9

9p = 1287

p = 1287/9

p = 143

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