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= x²+2x-15
2. (x+6) (x-2) = x²-2x+6x-12
= x²+4x-12
3. (x-5) (x+5) = x²+5x-5x-25
=x²-25
4. (x-7) (x-3) = x²-3x-7x+21
=x²-10x+21
5. (y+11)(y+12) = y²+12y+11y+132
= y²+23y+132
semoga membantu
⇔ x²-3x+5x-15=0
⇔ x²+2x+15=0
2.(x+6) (x-2)=?
⇔ x²-2x+6x-12=0
⇔ x²+4x-12=0
3,(x-5) (x+5)
⇔ x²+5x-5x-25=0
⇔ x²-25=0
4. (x-7) (x-3)=?
⇔ x²-3x-7x+21=0
⇔ x²-10x+21=0
5.(y+11) (y+2)=?
⇔ y²+2y+11y+22=0
⇔ y²+13y+22=0
semoga membantu :)