Question

7x(x+4)
7x^2+4
7x^2+28x
8x+4
8x+11

Answer 1

`7x^2+28x`

Explanation:

`7x(x+4)\\\\Multiplication\ is\ distributive\ on\ addition\\\\\Rightarrow 7x(x+4)=7(x* x+x* 4)\\\\7x(x+4)=7(x^2+4x)\\\\Multiplication\ is\ distributive\ on\ addition\\\\\Rightarrow 7x(x+4)==7* x^2+7* 4x\\\\7x(x+4)=7x^2+28x`