Answer:
Step-by-step explanation:
Its when they add X's/ Y's in the math problem aka a variable. And they use other symbols of equations and formulas. I hope this is what your looking for have a nice day!
(4c-1)(y+3)
4c(y+3) -(y+3)
=(4c-1)(y+3)
-8x^2+26x-21
(3-2x)(4x-7)
12x-8x^2-21+14x
-8x^2+12x+14x-21
25y2 i think
i hope it helps
x=10
