Answer:
The lengths of all sides of the patio are 15, 15, 9, 9.
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b=19
Step-by-step explanation:
2x(3x+5)+3(3x+5)=ax2 +bx+c
by expansion,
6x2 +10x +9x+15=6x2 +19x +15
x = 5, -3
x² - 15 = 2x
x² - 2x - 15 = 0
(x - 5)(x + 3) = 0
X=20
Explanation: