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а) (2m +3)² -3(m-4)(m+4) - 56
б) 5(3 - 2a)(2a + 3) - 2(a - 5)² +5
а) (2m +3)² -3(m-4)(m+4) - 56
б) 5(3 - 2a)(2a + 3) - 2(a - 5)² +5
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а) (2m +3)² -3(m-4)(m+4) - 56==4m²+12m+9-3(m²-16)-56=
=4m²+12m+9-3m²+48-56=
=m²+12m+1
б) 5(3 - 2a)(2a + 3) - 2(a - 5)² +5=
=5(3-2a)(3+2a)-2(a²-10a+25)+5=
=5(9-4a²)-2a²+20a-50+5=
=45-20a²-2a²+20a-45=
=20a-22a²