Question

упростите выражение
(y-5)(y+5)-2y(3-y)
4a(a-5)-(a+3)²
7(x-p)²+14xp

Answer 1

y-5)(y+5)-2y(3-y)=y²-25-6y+2y²=3y²-6y+25
4a(a-5)-(a+3)²=4a²-20a-a²-6a-9=3a²-26a-9
7(x-p)²+14xp=7x²-14xp+7p²+14xp=7x²+7p²

Answer 2

$1)(y-5)(y+5)-2y(3-y)=y ^{2} -25-6y+2y ^{2} =3y ^{2} -6y-25 \ 2)4a(a-5)-(a+3) ^{2} =4a ^{2} -20a-(a ^{2} +9+6a)= \ =4a ^{2} -20a-a ^{2} -9-6a=3a ^{2} -26a-9$

$3)7(x-p) ^{2} +14xp=7( x^{2} +p ^{2} -2xp)+14xp= \ =7 x^{2} +7p ^{2} -14xp+14xp=7 x^{2} +7p ^{2}$