find the value of p , if 9x²+3x-p=10 when p=-1
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9(-1)^2 + 3(-1) - p =10
= 9(1) -3 - p =10
= 9 - 3 - p = 10
= 6 -p = 10
= 6 - 10 = p
= p = -4
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