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3 years ago

Which equation shows the quadratic formula used correctly to solve 7x2 = 9+ x for x?

Mathematics

2 answers:

SCORPION-xisa [38]3 years ago

7 0

This can also be explained as D on edg :)

____ [38]3 years ago

6 0

Answer:

x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

Step-by-step explanation:

Solve for x:

7 x^2 = x + 9

Subtract x + 9 from both sides:

7 x^2 - x - 9 = 0

x = (1 ± sqrt((-1)^2 - 4×7 (-9)))/(2×7) = (1 ± sqrt(1 + 252))/14 = (1 ± sqrt(253))/14:

Answer: x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

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$\huge \boxed{\mathbb{QUESTION} \downarrow}$

Solve 2m + n = 2 and 3m - 2n = 3 using substitution.

$\large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}$

We can use the substitution method to solve linear equations of this form. Let's solve for m & n.

$\left. \begin{array} { l } { 2 m + n = 2 } \\ { 3 m - 2 n = 3 } \end{array} \right.$

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$\large \underline{\underline{ \bf \: n=0 }}$

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$\large \underline{ \underline{\bf \: m=1 }}$

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$\huge \boxed{ \boxed{ \bf \: m=1, \: n=0 }}$

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