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I need help with numbers 12 and 13. Pls help I really appreciate it. The instructions are to fill in the missing term to make a perfect square trinomial BRAINLY FOR THE CORRECT ANSWER !!!!!!!!!!!!!!!!! 10 POINTS!!!!!!!!!

I need help with numbers 12 and 13 Pls help I really appreciate it The instructions are to fill in the missing term to make a perfect square trinomial BRAINLY F class=

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xenia168

Answer:

Step-by-step explanation:

( a ± b )² = a² ± 2ab + b²

~~~~~~~~~~

81x² + _______ + 49 =

( 9x )² + _______ + 7² =

( 9x )² + 2 ( 9x )( 7 ) + 7² =

( 9x )² + 126x + 7² = ( 9x + 7 )²

-------------------

9b² - _______ + 36 =

( 3b )² - _______ + 6² =

( 3b )² - 2( 3b )( 6 ) + 6² =

( 3b )² - 36b + 6² = ( 3b - 6 )²

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