The important thing to note is that multiplication is just repeated addition. Thus nine x can be written as x+x+x+x+x+x+x+x+x. And we want to add another x onto the end of that. This can then be simplified back to the multiplication 10x. Therefore an equivalent expression to 9x+x is 10x
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what is equivalent to (x plus 4)2
7x + 28
when you say 3x, you mean that there are 3 x's. Multiplication implies repeated addition, so three x's added is x+x+x, which equals 3x.
x2 - 9x + 20 = (x - 4)( x - 5)
which expression is equivalent to (3 x 10^3) (5 x 10 ^5) sorry that is what i ment