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OpenStudy (anonymous):
Is the following problem simplified correctly? (5x+7)(5x-7)=25x2+70x-49
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myininaya (myininaya):
(5x+7)(5x-7)= 25x^2-49
myininaya (myininaya):
whenever you have (a-b)(a+b)=a^2-b^2
myininaya (myininaya):
\[5x(5x-7)+7(5x-7)=25x^2-35x+35x-49=25x^2-49\]
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