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Alex17521 [72]
3 years ago
9

If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? The value of a is _____________.

Mathematics
1 answer:
Lina20 [59]3 years ago
4 0
The factors, (9x - 4) and (9x +4), are obtained from factoring the sums of two square. Their product is obtained by subtracting the square of the second term from the square of the first term. 
 
                               (9x)² - (4)² = 81x² - 16

The values of a and b are 81 and 16, respectively. Therefore, the answer is 81. 

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