4-a)x(asquare+7a-18)=
(4-a) X (a^2 + 7a - 18)=
Solve for a over the real numbers:
-((a-4) (a^2+7 a-18)) = 0
Multiply both sides by -1:
(a-4) (a^2+7 a-18) = 0
Split into two equations:
a-4 = 0 or a^2+7 a-18 = 0
Add 4 to both sides:
a = 4 or a^2+7 a-18 = 0
The left hand side factors into a product with two terms:
a = 4 or (a-2) (a+9) = 0
Split into two equations:
a = 4 or a-2 = 0 or a+9 = 0
Add 2 to both sides:
a = 4 or a = 2 or a+9 = 0
Subtract 9 from both sides:
Answer: |
| a = 4 or a = 2 or a = -9
