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Simplify the following. 1.) y2 +5x+4 y2-3x-4 2.) -21a²b² 28a3b3 x²_9 3.) x2-7x+12​

Sagot :

Answer:

1.) 5y²+2x-4

Step-by-step explanation:

y²+5x+4y²-3x-4

5y²+5x-3x-4

5y²+2x-4

3.) Factor : 2-7x+12

14-7x

7(2-x) factor 7 out from the expression

I don't know the number 2

hope it helps