Lina200229 Lina200229

22-08-2016
Mathematics

contestada

1.(5y+4)^2
2.(5y+4)^3
3.a=5yb=4
Help!

Respuesta :

Аноним Аноним

22-08-2016

1)
(a+b)²=a²+2ab+b²

(5y+4)²
a=5y
b=4

Therefore:
(5y+4)²=(5y)²+2(5y)(4)+(4)²=25y²+40y+16

Answer: (5y+4)²=25y²+40y+16

2)
(a+b)³=a³+3a²b+3ab²+b³

(5y+4)³
a=5y
b=4

therefore:
(5y+4)³=(5y)³+3(5y)²(4)+3(5y)(4)²+(4)³=125y³+60y²+240y+64

Answer: (5y+4)³=125y³+60y²+240y+64

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