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Verified answer
3x + 9 = 6x - 69 + 6 = 6x - 3x
15 = 3x
x = 15/3 = 5
PR = 3x+9
= 3(5) + 9
= 15 + 9
= 24
QS = 6x-6
= 6(5) - 6
= 30 - 6
= 24
L = 1/2 x d1 x d2
= 1/2 x 24 x 24
= 288cm2