Answer:
y² - 14yz - 9
Step-by-step explanation:
-5(yz + 2) - 9yz + 1 + y²
-5yz - 10 - 9yz + 1 + y²
-14yz - 9 + y² (COLLECT LIKE TERMS)
y² -14yz - 9 (REARRANGE)
y^2 - 14yz - 9
-5(yz+2) - 9yz + 1 + y^2
-5yz -10 - 9yz +1 +y^2
