What is $b$ in this quadratic equation $3x^2 - 15 = 8x$ ?

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What is $b$ in this quadratic equation $3x^2 - 15 = 8x$ ?

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Answer 1 · 2018-05-10T13:21:24

$b=-8$

Explanation:

Given: $3x^2-15=8x$

Subtract $8x$ from both sides.

$3x^2color(white)(".")color(red)(-8)x-15=0$
$ax^2color(white)(".")ubrace(+color(red)(b))x+color(white)("d")c=0$
$color(white)(".d..d")darr$
$color(white)("dd")obrace(+(color(red)(-8)))color(white)("d")->-8$

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What is $b$ in this quadratic equation $3x^2 - 15 = 8x$ ?

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What is $b$ in this quadratic equation $3x^2 - 15 = 8x$ ?