(-r^2+3r-7)(r^2-7)=0

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Solution for (-r^2+3r-7)(r^2-7)=0 equation: 


Simplifying
(-1r2 + 3r + -7)(r2 + -7) = 0

Reorder the terms:
(-7 + 3r + -1r2)(r2 + -7) = 0

Reorder the terms:
(-7 + 3r + -1r2)(-7 + r2) = 0

Multiply (-7 + 3r + -1r2) * (-7 + r2)
(-7(-7 + r2) + 3r * (-7 + r2) + -1r2 * (-7 + r2)) = 0
((-7 * -7 + r2 * -7) + 3r * (-7 + r2) + -1r2 * (-7 + r2)) = 0
((49 + -7r2) + 3r * (-7 + r2) + -1r2 * (-7 + r2)) = 0
(49 + -7r2 + (-7 * 3r + r2 * 3r) + -1r2 * (-7 + r2)) = 0
(49 + -7r2 + (-21r + 3r3) + -1r2 * (-7 + r2)) = 0
(49 + -7r2 + -21r + 3r3 + (-7 * -1r2 + r2 * -1r2)) = 0
(49 + -7r2 + -21r + 3r3 + (7r2 + -1r4)) = 0

Reorder the terms:
(49 + -21r + -7r2 + 7r2 + 3r3 + -1r4) = 0

Combine like terms: -7r2 + 7r2 = 0
(49 + -21r + 0 + 3r3 + -1r4) = 0
(49 + -21r + 3r3 + -1r4) = 0

Solving
49 + -21r + 3r3 + -1r4 = 0

Solving for variable 'r'.

The solution to this equation could not be determined.

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