Question

For what value of a will –p3 + 15ap +p2 - 9 equal 16 for p=5?​

Answer 1

Answer:

-p³ + 15ap + p² - 9 = 16

(-5)³ + 15(a)(5) + (5)² - 9 = 16

125 + 75a + 25 - 9 = 16

125 +75a +16 =16

141 + 75a = 16

75a = 16 - 141

75a = -125

a = -125÷75

a = -5/3

∴ a = -1.666

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