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Can you help me solve this polynomial completely? a(2) - ab - 42b(2)

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Math.doc

a2 –ab – 42b2
= a2–7ab + 6ab – 42b2
= a(a – 7b) + 6b(a – 7b)
= (a + 6b)(a – 7b)
This implies that
a = -6b or 7b

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