Question

evaluate using identity (abc-3) (abc+7)​

Answer 1

Answer:

(abc)²-10abc+21

hope you find my answer helpful

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Step-by-step explanation:

Using (x-a)(X+b)= x²-(a+b)*X+(ab)

(abc)²-(3+7)*abc+(3*7)

=(abc)²-10abc+21

is the correct answer

Answer 2

Step-by-step explanation:

$(abc) {}^{2} - 4abc - 21 \\ \\ hope \: its \: help \: you$