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1) 3y²+8y+10
2) x³+3x²-x²-3x-2x-6 ⇒x³+2x²-5x-6
3)(2x-6)(x+3) ⇒ 2x²-18
4)25-y²
semoga membantu :)
=3y²+11y+10
1.(y+5)(y+3)=y²+3y+5y+15
=y²+8y+15
3. (x²-x-2)(x+3)= X³+3x²-x²-3x-2x-6
=x³+2x²-5x -6
4. 2(x-3)(x+3)= (2x-6)(x+3)
=2x²+6x-6x-18
= 2x²-18
5.(5-y)(5+y)=25+5y-5y-y²
=25-y²