English, asked by sxgdjgdkgxhkx, 5 months ago


49q {}^{2}  - 42qr + 9r {}^{2}

Answers

Answered by madhupathak2
2

49q-42qr+9r

(7q)square -2(7q) (3r)+(3r) square

(7q-3r) square

(a-b) square=a square +b square -2ab

Explanation:

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