palisthashrestha3
palisthashrestha3 palisthashrestha3
  • 10-09-2021
  • Mathematics
contestada

if a=3, b=-5 fond the value of (2a+3b) (4a sq- 6ab+9b square)​

Respuesta :

aniilsah555
aniilsah555 aniilsah555
  • 10-09-2021

Step-by-step explanation:

(2a+3b)(4a²-6ab+9b²

(2a+3b){(2a)²-2a×3b+(3b)²}

Because (a³+b³)=(a+b)(a²-ab+b²)

Therefore,

(2a+3b){(2a)²-2a×3b+(3b)²}

=(2a)³+(3b)³

By substituting the values , we get

  • (2a)³+(3b)³
  • (2×3)³+(3×(-5))³
  • 6³+(-15)³
  • 216+(-3375)
  • 216-3375
  • -3159
Answer Link

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