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3 years ago

Evaluate the expression when a= 1/4 and b = 6. 16a2 – 4b=

Mathematics

1 answer:

Degger [83]3 years ago

3 0

Step-by-step explanation:

HERE,

a= $\bold{\dfrac{1}{4} }$

b=6

so,

According to the question, 

$\bold{16a^2-4b }$

$\bold{16\times(\dfrac{1}{4})^2-4\times 6 }$

$\bold{ 16\times \dfrac{1}{16}-24 }$

$\bold{\cancel{16}\times \dfrac{1}{\cancel{16}}-24 }$

$\bold{1-24 }$

$\bold{ -23 }$

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3 years ago

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ivanzaharov [21]

Answer:

• x = -4, x = 0, x = 1

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Reversing the sign of the odd-degree terms gives signs of -++, so there is one sign change, hence one negative real root (by Descartes' rule of signs). This confirms choice 2 as the answer.

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Of course, your graphing calculator can answer this almost as quickly.

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