Question

162-163
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Answer 1

Решение на фото, которое прикреплено.  То, что в рамке- выучи)

Answer 2

$162. \ 1) (m+5) ^{2} -(m-5) ^{2} =m ^{2} +25+10m-m ^{2} -25+10m=20m \ 2)(6-n )^{2} -(n+6) ^{2}=36+n ^{2} -12n-n^{2} -36-12n=-24 \ 3)(x+y) ^{2} -(x-y) ^{2} = x^{2} +y^{2} +2xy- x^{2} -y ^{2} +2xy=4xy \ 4)(2p-q) ^{2} -(q+2p) ^{2} =4p ^{2} +q ^{2} -4pq-q^{2} -4p ^{2} -4pq=-8pq \ 5)(x-6)^{2} -9 x^{2} = x^{2} +36-12x-9 x^{2} =-8 x^{2} -12x+36 \ 6) 4y ^{2} -(y+3) ^{2} =4y ^{2} -y ^{2} -9-6y=3y ^{2} -6y-9$


$163. \ 1)81 x^{2} -9=0 \ 81 x^{2} =9 \ x^{2} = frac{1}{9} \ x=+- frac{1}{9} \ \ 2)16-4y ^{2} =0 \ -4y^{2} =-16 \ y ^{2} =4 \ y=+-2$

$3)16c^{2} -79=0 \ 16c^{2} =49 \ c ^{2} = frac{49}{16} \ c=+- frac{7}{4} \ \ 4)64 x^{2} -25=0 \ 64 x^{2} =25 \ x^{2} = frac{25}{64} \ x=+- frac{5}{8}$