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Factorise completely: 9x2 + 42x + 49
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Factorise completely: 9x2 + 42x + 49
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Oct 8, 2017
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Factorise completely: 9x2 + 42x + 49
Mathematics
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Ben Cox
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Answer:
i think the answer is (3x + 7)(3x + 7)
Explanation:
Joel Cochran
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Oct 10, 2017
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Joel Cochran
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This is a perfect square trinomial:
9 x² + 42 x + 49 = ( 3 x )² + 2 · 3 x · 7 + 7² =
= ( 3 x + 7 )² =
( 3 x + 7 ) · ( 3 x + 7 )
JMAA
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Oct 14, 2017
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JMAA
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