Question

(7m-3)²expand using an appropriate standard identity ​

Answer 1

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49m^2 + 9 - 42m

Step-by-step explanation:

(7m-3)^2

(7m)^2 + (3)^2 - 2 × 7m × 3

49m^2 + 9 - 42m

Answer 2

Answer:

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

(7m-3)^2=(7m)^2-2(7m)(-3)+(-3)^2

=49m^2-14m(-3)+9

=49m^2+42m+9

=49m^2+21m+21m+9

=7m(7m+3)+3(7m+3)

=(7m+3)(7m+3)

m= -3/7 or m=-3/7

Step-by-step explanation:

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