Answer:
x(x+4) = 21, or x²+4x-21 = 0
Explanation:
b = -5/2
- 6 (b + 3)= - 8 + 5
- 6b - 18= - 3
- 6b= - 3 + 18
- 6b= 15
b= - 15/6
b= - 5/2
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