How do you use the additive inverse to evaluate an expression that uses subtraction?

Find the complete factored form of the polynomial 40m^3n^2+45m^2n^6

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∠aed is formed inside a circle by two intersecting chords. if minor arc bd = 70 and minor arc ac = 180, what is the measure of ∠ aed? a) 45° b) 50° c) 55° d) 60°