Question

Please tell me the answer to this question. Give a step by step explanation as well.

Answer 1

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  `\sf{(5d+4)(3d-1) }`

• 
  `\sf{ 5d(3d-1)+4(3d-1) }`

• 
  `\sf{15d^2-5d+12d-4 }`

• 
  `\sf{15d^2+(-5+12)d-4 }`

• 
  `\sf{ 15d^2+7d-4 }`

`\sf{ }`
`\sf{ }`
`\sf{ }`
`\sf{ }`

Answer 2

15d^2 +7d-4

Explanation:

(5d+4)(3d-1)

FOIL

first 5d*3d = 15d^2

outer 5d(-1) = -5d

inner 4*3d = 12d

last 4*-1 = -4

Add together

15d^2 -5d+12d -4

15d^2 +7d-4