3 years ago

What substitution should be used to rewrite 4x^4-21x^2+20=0 as a quadratic equation

1 answer:

7 0

Answer:

u = x^2

Step-by-step explanation:

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beks73 [17]

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kolezko [41]

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Anna35 [415]

Answer:14 m

Step-by-step explanation:

Dada

larga $l=20\ m$

superficie $A=280\ m^2$

Suponga que el ancho es w

La superficie está dada por el producto de la longitud y la anchura.

$\therefore A=lw\\\Rightarrow 280=20\times w\\\Rightarrow w=14\ m$

Por lo tanto, el ancho es de 14 m.

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3 years ago

What substitution should be used to rewrite 4x^4-21x^2+20=0 as a quadratic equation ​