Question

Find the value of the polynomial p(x)=3x

2+7x-8

at X=-2 and x=5.​

Answer 1

Answer:

${3x}^{2} + 7x - 8 \: \: \: \: \: \: \: \: \: (x = - 2) \\ {3( - 2)}^{2} + 7( - 2) - 8 \\ 12 - 14 - 8 \\ - 10 \\ {3x}^{2} + 7x - 8 \: \: \: \: \: \: \: \: \: (x = 5) \\ 3 {(5)}^{2} + 7(5) - 8 \\ 75 + 35 - 8 \\ 102$

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Answer 2

$1) \: \: \: \: x = - 2$

$= 3 {x}^{2} + 7x - 8$

$= 3 {( - 2)}^{2} + 7( - 2) - 8$

$= 3(4) - 14 - 8$

$= 12 - 22$

$= - 10$

$2) \: \: \: \: x = 5$

$= 3 {x}^{2} + 7x - 8$

$= 3( {5)}^{2} + 7(5) - 8$

$= 3(25) + 35 - 8$

$= 75 + 27$

$= 102$