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Mathematics
Algebra
Quadratic Equations

factor -16sin^2a+81

1 answer
asked by sasha
11 years ago
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Use difference of two squares:

-16sin^2a+81
=81-16sin^2a
=9²-(4sin(a))²
=(9+4sin(a))(9-4sin(a))

answered by MathMate
11 years ago
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