Simplify:
(−7a−4b7)(3a2b−4)
(1 point)
Responses
−21b3a2
the fraction with numerator negative 21 b cubed and denominator A squared
−21a6b3
the fraction with numerator negative 21 and denominator A to the 6th power b cubed
−21a8b28
the fraction with numerator negative 21 and denominator A to the 8th power b to the 28th power
−21a2b3
1 answer
-21a^2b^3