Expand using identities. a. (b - 7)² b. (xy + 3z)
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a.
by using the second identity: (a-b)² = a²-2ab+b²
(b-7)²
=b²-2 (b)(7) +7²
=b²-14b+49
b. i think it is not written correctly
if it is (xy+3z)² then the answer will be
Using (a+b)²=a² +2ab+b²
we get,
(xy)² +2(xy)(3z)+(3z)²
=x²y² +6xyz+3z²
=x²y²+6xy+9z²
hopes it helps u
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