Question

16x²-72x+81 is perfect square of ———, Fill in the blanks to correct the given statement.

Answer 1

$16x {}^{2} - 72x + 81 \: is \: perfect \: square \: of \: (4x - 9)$

Answer 2

Answer:

( 4x - 9 )²

Step-by-step explanation:

16x² - 72x + 81

= ( 4x )² - 2*4x*9 + 9²

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We know the algebraic identity:

a² - 2ab + b² = ( a - b )²

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= ( 4x - 9 )²

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