Question

-2(10r + 4) + 10(7r + 2)

Answer 1

The answer would be 50r+12

-2(10r+4)+10(7r+2)

Remove parentheses

-20r-8+70r+20

Collect like terms

50r+12

Answer 2

`\large\boxed{-2(10r+4)+10(7r+2)=50r+12}`

Explanation:

`-2(10r+4)+10(7r+2)\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\\\=(-2)(10r)+(-2)(4)+(10)(7r)+(10)(2)\\\\=-20r-8+70r+20\qquad\text{combine like terms}\\\\=(-20r+70r)+(-8+20)\\\\=50r+12`