To expand (12a^3 - 7x)^2, we use the formula (a + b)^2 = a^2 + 2ab + b^2:
(12a^3 - 7x)^2 = (12a^3)^2 + 2(12a^3)(-7x) + (-7x)^2
= 144a^6 - 168a^3x + 49x^2
Therefore, the expanded form of (12a^3 - 7x)^2 is 144a^6 - 168a^3x + 49x^2.
expand (12a^3 - 7x)^2
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